$$y-\frac{4}{7}y=1\frac{2}{5}$$
$y = \frac{49}{15} = 3\frac{4}{15} \approx 3.266666667$
$$35y-20y=7\left(1\times 5+2\right)$$
$$15y=7\left(1\times 5+2\right)$$
$$15y=7\left(5+2\right)$$
$$15y=7\times 7$$
$$15y=49$$
$$y=\frac{49}{15}$$
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