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 -6a + 8a = -7a - 6z + 9 for a in terms of z.
| -14z + 9 | |
| -1\(\frac{1}{5}\)z - \(\frac{2}{5}\) | |
| z - \(\frac{2}{7}\) | |
| -\(\frac{2}{3}\)z - \(\frac{1}{4}\) |