South Carolina Get Ready Grade 8 Mathematics Chapter 4

7a + 2a = 9

a =

Find the value of x that makes each equation true.

$\frac{x}{5}+\frac{x}{4}=3$

x =

The problems below contain at least one error. Find the error(s), and find the correct solution. Show your work for each step.

$$\begin{gathered} 4(2x - 2) + 12 = 21 \\ 8x - 8 + 12 = 21 \\ 8x - 4 = 21 \\ 8x - 4 + 4 = 21 + 4 \\ 8x = 25 \\ \frac{8x}{8}=\frac{25}{8} \\ x=3\frac{1}{8} \end{gathered}$$