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 = a + 7z + 2 for a in terms of z.
| -3z - 6 | |
| -8z - 1 | |
| 8z + 8 | |
| z - 3 |