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 8a + 5a = 4a + 9z - 2 for a in terms of z.
| -7z + 7 | |
| z - \(\frac{1}{2}\) | |
| -1\(\frac{1}{12}\)z - \(\frac{1}{2}\) | |
| -9z + 8 |