$$3(y-4)+6(y-6)=12$$
$y = \frac{20}{3} = 6\frac{2}{3} \approx 6.666666667$
$$3y-12+6\left(y-6\right)=12$$
$$3y-12+6y-36=12$$
$$9y-12-36=12$$
$$9y-48=12$$
$$9y=12+48$$
$$9y=60$$
$$y=\frac{60}{9}$$
$$y=\frac{20}{3}$$
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