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 - 6a = 2a + 7z - 1 for a in terms of z.
| z - \(\frac{1}{7}\) | |
| -3\(\frac{1}{4}\)z + \(\frac{1}{4}\) | |
| 1\(\frac{1}{2}\)z + 4\(\frac{1}{2}\) | |
| \(\frac{1}{13}\)z + \(\frac{5}{13}\) |