M + 9 = -12

what do you do first

You subtract 9 from both sides

Step-by-step explanation:

You have to get the variable by itself to solve so you subract 9 by 9 and they cancel each other out. Then you do -12-9 and since they are both negative you get get -21

Them you have your answer m=-21, you can check this by plugging m inot the equation

If you are solving for M

You would subtract 9

m + 9 = -12

    - 9    - 9

M = -21

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e