$$8-4s=5+13......s=$$
$s = -\frac{5}{2} = -2\frac{1}{2} = -2.5$
$$8-4s=18$$
$$-4s=18-8$$
$$-4s=10$$
$$s=\frac{10}{-4}$$
$$s=-\frac{5}{2}$$
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