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