Question

Answer 1

\(\Leftrightarrow3^x\cdot\dfrac{1}{3}-3^x\cdot9=-540\)

\(\Leftrightarrow3^x=\dfrac{810}{13}\)

Answer 2

\(\dfrac{7}{3}.3^x-9.3^x=-540\)

\(\Rightarrow-\dfrac{20}{3}.3^x=-540\)

\(\Rightarrow3^x=81\)

\(\Rightarrow x=4\)