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 - 5a = -9a - 4z - 4 for a in terms of z.
| -\(\frac{2}{5}\)z + 1\(\frac{2}{5}\) | |
| -z - 2 | |
| \(\frac{5}{13}\)z - \(\frac{3}{13}\) | |
| \(\frac{1}{16}\)z - \(\frac{1}{4}\) |