$$18 y + 3 y - \frac { 3 } { 5 } = 21 + 5 y - 2 y$$
$y = \frac{6}{5} = 1\frac{1}{5} = 1.2$
$$21y-\frac{3}{5}=21+5y-2y$$
$$21y-\frac{3}{5}=21+3y$$
$$21y-\frac{3}{5}-3y=21$$
$$18y-\frac{3}{5}=21$$
$$18y=21+\frac{3}{5}$$
$$18y=\frac{105}{5}+\frac{3}{5}$$
$$18y=\frac{105+3}{5}$$
$$18y=\frac{108}{5}$$
$$y=\frac{\frac{108}{5}}{18}$$
$$y=\frac{108}{5\times 18}$$
$$y=\frac{108}{90}$$
$$y=\frac{6}{5}$$
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