$$3(5-h)-2(h-2)=-1$$
$h=4$
$$15-3h-2\left(h-2\right)=-1$$
$$15-3h-2h+4=-1$$
$$15-5h+4=-1$$
$$19-5h=-1$$
$$-5h=-1-19$$
$$-5h=-20$$
$$h=\frac{-20}{-5}$$
$$h=4$$
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