\(3^{x+1}-2^{2x+1}-12^{\dfrac{x}{2}}=0\)
\(\Leftrightarrow3.3^x-2.4^x-\sqrt{3^x.4^x}=0\)
\(\Leftrightarrow3.\dfrac{3^x}{4^x}-\sqrt{\dfrac{3^x}{4^x}}-2=0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left(\dfrac{3}{4}\right)^x=-\dfrac{2}{3}\left(l\right)\\\left(\dfrac{3}{4}\right)^x=1\end{matrix}\right.\)
\(\Rightarrow x=0\)