$$\frac{4a-5}{7}=4a-15$$
$a = \frac{25}{6} = 4\frac{1}{6} \approx 4.166666667$
$$4a-5=28a-105$$
$$4a-5-28a=-105$$
$$-24a-5=-105$$
$$-24a=-105+5$$
$$-24a=-100$$
$$a=\frac{-100}{-24}$$
$$a=\frac{25}{6}$$
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