$$2(y-4)+3(y+4)=12$$
$y = \frac{8}{5} = 1\frac{3}{5} = 1.6$
$$2y-8+3\left(y+4\right)=12$$
$$2y-8+3y+12=12$$
$$5y-8+12=12$$
$$5y+4=12$$
$$5y=12-4$$
$$5y=8$$
$$y=\frac{8}{5}$$
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