$$\left. \begin{array} { l } { \frac { y } { 3 } + 1 = \frac { 7 } { 15 } } \end{array} \right.$$
$y = -\frac{8}{5} = -1\frac{3}{5} = -1.6$
$$5y+15=7$$
$$5y=7-15$$
$$5y=-8$$
$$y=\frac{-8}{5}$$
$$y=-\frac{8}{5}$$
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