Answer
$y=-\frac{2x}{3}+5$
Work Step by Step
By adding $2x$ to each side and then dividing each side by $-3$, we get
$$-2x-3y=-15\Longrightarrow -3y=-15+2x \\
\Longrightarrow y=-\frac{-15+2x}{3}=-\frac{2x}{3}+5
.$$
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