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