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 7a + 7a = 6a + z + 1 for a in terms of z.
| -6z + 1 | |
| -8\(\frac{1}{2}\)z + 3 | |
| -1\(\frac{1}{2}\)z - 3 | |
| -\(\frac{4}{5}\)z - 1\(\frac{3}{5}\) |