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 -a - 9a = 7a - 6z - 6 for a in terms of z.
| -7z + 8 | |
| -\(\frac{3}{8}\)z + \(\frac{3}{4}\) | |
| \(\frac{5}{11}\)z - \(\frac{9}{11}\) | |
| 1\(\frac{1}{8}\)z - \(\frac{3}{4}\) |