7. 12a + 5-8a=-1

I do not know how to do it

a=-3/2

Step-by-step explanation:

12a+5-8a=-1

12a-8a+5=-1

4a+5=-1

4a=-1-5

4a=-6

a=-6/4

simplify

a=-3/2

Isolate the variable by dividing each side by factors that don't contain the variable.

Exact Form:

a=-32

Decimal Form:

a=-1.5

Mixed Number Form:

a=-112

Step-by-step explanation:

you should go to math. ways they know everything