\(a,\Rightarrow x=9\\ b,\Rightarrow x+27=300\Rightarrow x=273\\ c,\Rightarrow3\left(x-18\right)=3\\ \Rightarrow x-18=1\Rightarrow x=19\\ d,\Rightarrow\left[{}\begin{matrix}x-5=0\\14-x=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=5\\x=14\end{matrix}\right.\\ e,\Rightarrow11x=121\Rightarrow x=11\\ f,\Rightarrow3^{x+2}=20+7=27=3^3\\ \Rightarrow x+2=3\Rightarrow x=1\)
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