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 9a + 2a = a + 8z - 5 for a in terms of z.
| -4z + 7 | |
| -\(\frac{6}{7}\)z - \(\frac{9}{14}\) | |
| -3\(\frac{1}{2}\)z + \(\frac{1}{2}\) | |
| \(\frac{3}{4}\)z - \(\frac{5}{8}\) |