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 - 7a = -4a - z - 7 for a in terms of z.
| -1\(\frac{7}{10}\)z + \(\frac{1}{2}\) | |
| 2\(\frac{1}{2}\)z + 1\(\frac{1}{3}\) | |
| -\(\frac{11}{13}\)z + \(\frac{6}{13}\) | |
| 3z - 3\(\frac{1}{2}\) |