$$5(1+2y)=(y-3)3$$
$y=-2$
$$5+10y=\left(y-3\right)\times 3$$
$$5+10y=3y-9$$
$$5+10y-3y=-9$$
$$5+7y=-9$$
$$7y=-9-5$$
$$7y=-14$$
$$y=\frac{-14}{7}$$
$$y=-2$$
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