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 + 9a = -2a - z + 9 for a in terms of z.
| -2\(\frac{3}{4}\)z - 2 | |
| -2\(\frac{2}{5}\)z + 1\(\frac{3}{5}\) | |
| -z + \(\frac{9}{10}\) | |
| 3z - 2 |