 Hello and welcome to the session. In this session we discussed the following question which says, simplify 2a minus square bracket open 3b minus 4 curly bracket open 2a minus 3 parenthesis open 2a minus 5b plus 3a under the bar parenthesis closed curly bracket closed and square bracket closed. Before we move on to the solution let's discuss the order of the removal of the brackets in an algebraic expression. In an algebraic expression first we remove the bar then the parenthesis then the curly brackets then the square brackets. This is the key idea that we use for this question. Let's proceed with the solution now. The expression that we need to simplify is 2a minus square bracket open 3b minus 4 curly bracket open 2a minus 3 parenthesis open 2a minus 5b plus 3a under the bar parenthesis closed curly bracket closed square bracket closed. Now according to the order of the removal of brackets in an algebraic expression first we need to remove the bar in the given algebraic expression. So this is the bar first we will remove this bar. So this is equal to 2a minus square bracket open 3b minus 4 curly bracket open 2a minus 3 parenthesis open 2a. As you can see that there is a minus sign before the expression which is under the bar. Now when we remove this bar the sign of the terms which are under this bar would be changed like this plus 5b would become minus 5p plus 3a becomes minus 3a then parenthesis closed curly bracket closed square bracket closed. Now this is further equal to 2a minus square bracket open 3b minus 4 curly bracket open 2a minus 3 parenthesis open. Now 2a minus 3a is minus a minus 5p parenthesis closed curly bracket closed square bracket closed. Now next we have to remove the parenthesis as given in the order. So this is equal to 2a minus square bracket open 3b minus 4 curly bracket open 2a. Now when we remove the parenthesis this becomes plus 3a plus 15b that is you multiply this 3 with each term inside the parenthesis curly bracket closed square bracket closed. Then this is equal to 2a minus square bracket open 3b minus 4 curly bracket open 2a plus 3a is 5a plus 15b curly bracket closed square bracket closed. Now next we remove the curly brackets this is equal to 2a minus square bracket open 3b. Now when we remove the curly brackets we multiply minus 4 by 5a to get minus 20a minus 4 by 15b to get minus 60b square bracket closed. This is equal to 2a minus square bracket open minus 20a 3b minus 60b is minus 57b. Now lastly we remove the square brackets. Now since there is a minus sign before the square bracket so we change the sign of the terms inside the square brackets when we remove the brackets. So this is equal to 2a plus 20a plus 57b which is equal to 22a plus 57b. Thus on simplifying the given expression we get 22a plus 57b. So final answer is 22a plus 57b. This completes the session hope you have understood the solution of this question.