$$0.25 ( 8 a - 0.5 ) = 7 \cdot 5$$
$a=17.5625$
$$2a-0.125=7\times 5$$
$$2a-0.125=35$$
$$2a=35+0.125$$
$$2a=35.125$$
$$a=\frac{35.125}{2}$$
$$a=\frac{35125}{2000}$$
$$a=\frac{281}{16}$$
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