$$\frac{ 3 }{ 4 } y+3=21$$
$y=24$
$$\frac{3}{4}y=21-3$$
$$\frac{3}{4}y=18$$
$$y=18\times \frac{4}{3}$$
$$y=\frac{18\times 4}{3}$$
$$y=\frac{72}{3}$$
$$y=24$$
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