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 - 4a = -9a + 9z - 1 for a in terms of z.
| 12z + 8 | |
| -8z - 7 | |
| 1\(\frac{2}{11}\)z - \(\frac{1}{11}\) | |
| 1\(\frac{3}{5}\)z + \(\frac{3}{5}\) |