$$\frac { 4 } { 5 } = \frac { 12 y } { 4 } - \frac { 4 } { 5 }$$
$y=\frac{8}{15}\approx 0.533333333$
$$16=5\times 12y-16$$
$$16=60y-16$$
$$60y-16=16$$
$$60y=16+16$$
$$60y=32$$
$$y=\frac{32}{60}$$
$$y=\frac{8}{15}$$
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