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 = -c - 8z + 7 for c in terms of z.
| -5\(\frac{1}{2}\)z + 2\(\frac{1}{2}\) | |
| -10z - 9 | |
| -\(\frac{6}{7}\)z - \(\frac{4}{7}\) | |
| \(\frac{1}{8}\)z + \(\frac{7}{8}\) |