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 7a - 3a = 5a + 9z - 9 for a in terms of z.
| 6z - 4\(\frac{1}{2}\) | |
| -1\(\frac{3}{5}\)z - \(\frac{7}{10}\) | |
| \(\frac{1}{4}\)z - \(\frac{1}{2}\) | |
| 1\(\frac{1}{3}\)z - 1\(\frac{1}{3}\) |