\[\frac{3 - 2y^{\backslash 6}}{y^{2}} - \frac{y - 12^{\backslash y}}{6y} =\]
\[= \frac{18 - 12y - y^{2} + 12y}{6y^{2}} = \frac{18 - y^{2}}{6y^{2}}\]