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 - a = -9a + 6z - 2 for a in terms of z.
| -\(\frac{1}{13}\)z - \(\frac{3}{13}\) | |
| -2z + 9 | |
| 1\(\frac{1}{7}\)z - \(\frac{3}{7}\) | |
| z - \(\frac{2}{7}\) |