When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
Solve 9c + 3c = -9c + 3x - 7 for c in terms of x.
| -9x - 2 | |
| x + 3\(\frac{1}{2}\) | |
| -\(\frac{1}{2}\)x - 1\(\frac{1}{3}\) | |
| x - \(\frac{7}{18}\) |