Question

(-12) - x = 9
how does this work?

Answer 1

-12 - x = 9
Add both sides by 12
-x = 21
Multiply both sides by -1
x = -21

That's your answer. Have an awesome day! :)

From your friendly Helper-in-Training, collinjun0827

Answer 2

=-21 that’s how it works cause we learned this in class today