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