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 3c - 9c = 6c + 5z + 8 for c in terms of z.
| 13z - 8 | |
| -4\(\frac{2}{3}\)z - 2\(\frac{2}{3}\) | |
| -\(\frac{7}{10}\)z + \(\frac{3}{10}\) | |
| -2z + 4 |