Answer
$x\leq 6$
Please see image
Work Step by Step
$ 4+\displaystyle \frac{3}{2}x\leq 13\qquad$ ...add $-4$ to each side of the inequality.
$ 4-4+\displaystyle \frac{3}{2}x\leq 13-4\qquad$ ...simplify.
$\displaystyle \frac{3}{2}x\leq 9\qquad$ ...multiply with $2$.
$ 3x\leq 18\qquad$ ...divide with $3$.
$x\leq 6$
