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