$$\frac{5y}{6}-\frac{3y}{5}=50$$
$y = \frac{1500}{7} = 214\frac{2}{7} \approx 214.285714286$
$$5\times 5y-6\times 3y=1500$$
$$25y-6\times 3y=1500$$
$$25y-18y=1500$$
$$7y=1500$$
$$y=\frac{1500}{7}$$
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