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 + 9c = 7c - z + 9 for c in terms of z.
| \(\frac{5}{7}\)z - \(\frac{9}{14}\) | |
| -\(\frac{3}{13}\)z + \(\frac{9}{13}\) | |
| -9z + 3 | |
| 6z + 7 |