[tex]\sf \iff \dfrac{2\cdot \left(3^6+3^5\right)}{3^4-3^3}\\\\\\\sf \iff2\cdot \left(3^6+3^5\right)=1944\\\\\\\sf \iff 3^4-3^3=54\\\\\\\sf \iff =\dfrac{1944}{54}\\\\\\\to \large \boxed{\boxed{\sf =36}}[/tex]
