$$0.25(8a-0.5)=7.5$$
$a=3.8125$
$$8a-0.5=\frac{7.5}{0.25}$$
$$8a-0.5=\frac{750}{25}$$
$$8a-0.5=30$$
$$8a=30+0.5$$
$$8a=30.5$$
$$a=\frac{30.5}{8}$$
$$a=\frac{305}{80}$$
$$a=\frac{61}{16}$$
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