$$7y/5=5(y-4)$$
$y = \frac{50}{9} = 5\frac{5}{9} \approx 5.555555556$
$$7y=25\left(y-4\right)$$
$$7y=25y-100$$
$$7y-25y=-100$$
$$-18y=-100$$
$$y=\frac{-100}{-18}$$
$$y=\frac{50}{9}$$
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