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