$$\frac { y - 3 } { 5 } = \frac { y - 4 } { 6 }$$
$y=-2$
$$6\left(y-3\right)=5\left(y-4\right)$$
$$6y-18=5\left(y-4\right)$$
$$6y-18=5y-20$$
$$6y-18-5y=-20$$
$$y-18=-20$$
$$y=-20+18$$
$$y=-2$$
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