3^3×（9^m+4）÷（27^2m-1）=729
3^3x9^m+4）÷（3^(2m-1)x3=27^2
3^3x9^m+4）÷（3^(2m-1)x3=3^6
3^2(m+4)=3^3x3^6m-3
2m+8=6m
m=2