Question

(15+x):3=3^15:3^12

Answer 1

\(\left(15+x\right):3=3^{15}:3^{12}\)
\(\left(15+x\right)=3^3.3\)
\(15+x=3^4\)
\(x=81-15\)
\(x=66\)

Answer 2

\(\left(15+x\right):3=3^{15}:3^{12}\)

\(\left(15+x\right):3=3^{15-12}\)

\(\left(15+x\right):3=3^3\)

\(15+x=3^3.3\)

\(15+x=81\)

\(x=81-15\)

\(x=66\)