$$2\times10/8=y-20$$
$y = \frac{45}{2} = 22\frac{1}{2} = 22.5$
$$2\times 10=8y-160$$
$$20=8y-160$$
$$8y-160=20$$
$$8y=20+160$$
$$8y=180$$
$$y=\frac{180}{8}$$
$$y=\frac{45}{2}$$
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