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 + 9c = -c - 3x + 7 for c in terms of x.
| x + 5 | |
| -\(\frac{1}{7}\)x + \(\frac{2}{7}\) | |
| -1\(\frac{1}{5}\)x + \(\frac{7}{10}\) | |
| \(\frac{7}{9}\)x + \(\frac{7}{9}\) |