Simplify:

$$\begin{gathered} \left(a\right)\raisebox{1ex}{$0$}\!\left/ \!\raisebox{-1ex}{$m+7$}\right.,wherem\ne -7 \\ \left(b\right)\raisebox{1ex}{$18-6c$}\!\left/ \!\raisebox{-1ex}{$0$}\right.,where18-6c\ne 0 \end{gathered}$$

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