$$8x+5/2=13$$
$x = \frac{21}{16} = 1\frac{5}{16} = 1.3125$
$$8x=13-\frac{5}{2}$$
$$8x=\frac{26}{2}-\frac{5}{2}$$
$$8x=\frac{26-5}{2}$$
$$8x=\frac{21}{2}$$
$$x=\frac{\frac{21}{2}}{8}$$
$$x=\frac{21}{2\times 8}$$
$$x=\frac{21}{16}$$
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