 Welcome to the session. Let us discuss the following question. The question says it plus y y z minus 7 z x from 5 x y minus 2 y z minus 2 z x plus 10 x y z. Before proceeding for its solution, let us recall that subtraction is the same as additive inverse for this question. See its solution subtract first expression from the second expression. So let us write second expression in the first row. So here 5 x y minus 2 y z minus 2 z x plus 10 x y z. Now let us write first expression in the second row with light terms one below the other. So 3 x y and 5 x y are light terms. So let us write 3 x y below 5 x y. Let us write 5 y z below minus 2 y z as they are light terms. Let us write minus 7 z x below minus 2 z x as they are light terms. Now we need to subtract 3 x y plus 5 y z minus 7 z x from this expression or we can say that we need to add the additive inverse of this expression that is 3 x y plus 5 y z minus 7 z x to the first expression. If the additive inverse of this expression we will change the signs of all the terms from plus to minus and from minus to plus. So the additive inverse of 3 x y is minus 3 x y, additive inverse of plus 5 y z is minus 5 y z and additive inverse of minus 7 z x is plus 7 z x. Subtracting 3 x y from 5 x y is minus 3 x y to 5 x y. So 5 x y is equal to minus 3 x y as 5 minus 3 is 2. So we will get z is equal to minus 2 y z minus 5 as minus 2 minus 5 is equal to minus 7 plus 5 z x. We finish our session. Hope you must have enjoyed it.