solve for c

Question

A= -3(a + b - 1/3c)

Answer 1

Assuming you mean
A= -3(a + b - (1/3)c)
when parentheses are used correctly.

Divide both sides by -3, and swap sides
a+b-(1/3)c = -A/3
-(1/3)c = -A/3-a-b

Divide both sides by -(1/3)
c = A+3a+3b

Answer 2

thank u

Answer 3

You're welcome!