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 + 9a = -8a + 6z - 4 for a in terms of z.
| z - 8 | |
| -\(\frac{3}{11}\)z - \(\frac{4}{11}\) | |
| 1\(\frac{1}{4}\)z + \(\frac{1}{2}\) | |
| -5z - 4 |