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