Question

I BEGG YOU PEOPLE PLEASE

Answer 1

Step 1:

align the variables

Step 2:

find the sum

`4a-7ab+3b+12\\12a-9ab+5b-3\\---------\\16a-16ab+6b+9`

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Answer 2

15a -9ab + 2b - 15

Explanation:

12a - 9ab + 5b - 3 -( 4a -7a + 3b + 12)

12a - 9ab + 5b -3 -4a + 7a - 3b - 12

15a -9ab + 2b - 15