Question

Solve for c:
12 - 9 + c = 12

Answer 1

c=9

Explanation:

To solve, we must isolate the variable, c

12-9+c=12

Combine like terms (subtract 9 from 12)

3+c=12

Subtract 3 from both sides to "reverse" the addition being done to c

c=9

Answer 2

Explanation:

12 - 9 + c = 12

-9 + c = 12 - 12

- 9 + c = 0

Therefore c = 9

Hope this helps.!