\(\left(6x-39\right)\div3=201\)
\(6x-39=201.3\)
\(6x-39=603\)
\(6x=603+39=642\)
\(\Rightarrow x=642\div6=107\)
\(23+3x=5^6\div5^3\)
\(23+3x=5^{6-3}\)
\(23+3x=5^3=125\)
\(3x=125-23\)
\(3x=102\)
\(\Rightarrow x=34\)
\(541+\left(218-x\right)=735\)
\(218-x=735-541\)
\(218-x=194\)
\(x=218-194\)
\(x=24\)
\(5\left(x+35\right)=515\)
\(x+35=515\div5\)
\(x+35=103\)
\(x=103-35\)
\(x=68\)