The inequality is
.
Apply multiplication property of inequality:
. \ \
(Multiply each side by 3)
(Cancel common terms)
(Multiply:
)
(Multiply each side by negative one and flip the symbol)
(Product of two same signs is positive sign)
The solution set is
.
Graph the solution set on a number line.
Note: The point indicated with closed circle is included in the solution set.
The graph of
is

The inequality solution set is
.