$$0.25c+5=0.5c-2.5$$
$c=30$
$$0.25c+5-0.5c=-2.5$$
$$-0.25c+5=-2.5$$
$$-0.25c=-2.5-5$$
$$-0.25c=-7.5$$
$$c=\frac{-7.5}{-0.25}$$
$$c=\frac{-750}{-25}$$
$$c=30$$
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