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 -7c + 7c = -c + 2z + 9 for c in terms of z.
| -2z - 1 | |
| -\(\frac{13}{14}\)z - \(\frac{5}{14}\) | |
| \(\frac{5}{6}\)z - 1\(\frac{1}{2}\) | |
| -2\(\frac{1}{5}\)z - \(\frac{1}{5}\) |