Question

What is the answer to
-2a-9=6a+15

Answer 1

a=-3

Explanation:

-2a-9=6a+15

+2a +2a

-9=8a+15

-15 -15

-24=8a

8 8

-3=a

Answer 2

`a=-3`

Explanation:

`-2a-9=6a+15`

Add 9 to both sides:

`-2a-9+9=6a+15+9`

`-2a=6a+24`

Subtract 6a from both sides:

`-2a-6a=6a+24-6a`

`-8a=24`

Divide both sides by -8:

`(-8a)/(-8)=(24)/(-8)`

`a=-3`