Solving $\varphi(x)=2$, $\varphi(x)=8$, $\varphi(x)=12$ and $\varphi(x)=14$ · Prove2Me

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Solving $\varphi(x)=2$, $\varphi(x)=8$, $\varphi(x)=12$ and $\varphi(x)=14$ · Prove2Me