Question

(-8ab+7a-5)-(-7ab+2) find the difference

Answer 1

-8ab + 7a - 5 - (-7ab + 2)....distribute through the parenthesis
-8ab + 7a - 5 + 7ab - 2....combine like terms
-ab + 7a - 7 <===

Answer 2

$(-8ab+7a-5)-(-7ab+2)$ 

Solving an equation means finding a value of a variable that make the equation true. This value is called the solution of the equation. A mathematical equation is just like a balanced equation. Both sides of the equation should be equal at all times. Whatever we do to one side, has to be done on the opposite side. 

$-8ab+7a-5+7ab-2$ 

$(-8ab+7ab)+7a-5-2$   $Gather \ like \ terms$ 

$-ab+7a-5-2$ 

$-ab+7a-7$