$$Y-5=3y-25$$
$Y=3y-20$
$$Y=3y-25+5$$
$$Y=3y-20$$
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$y=\frac{Y+20}{3}$
$$3y-25=Y-5$$
$$3y=Y-5+25$$
$$3y=Y+20$$
$$\frac{3y}{3}=\frac{Y+20}{3}$$
$$y=\frac{Y+20}{3}$$