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 3a + 6a = -7a + 2z + 4 for a in terms of z.
| 9z + 8 | |
| -\(\frac{2}{5}\)z + \(\frac{2}{5}\) | |
| -1\(\frac{1}{7}\)z + \(\frac{3}{7}\) | |
| 1\(\frac{1}{9}\)z + 1 |