$$\left. \begin{array} { l } { 13 ( y - 4 ) - 3 ( y - 9 ) - 5 ( y + 4 ) = 0 } \end{array} \right.$$
$y=9$
$$13y-52-3\left(y-9\right)-5\left(y+4\right)=0$$
$$13y-52-3y+27-5\left(y+4\right)=0$$
$$10y-52+27-5\left(y+4\right)=0$$
$$10y-25-5\left(y+4\right)=0$$
$$10y-25-5y-20=0$$
$$5y-25-20=0$$
$$5y-45=0$$
$$5y=45$$
$$y=\frac{45}{5}$$
$$y=9$$
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