3 log 9 – 3 log 2 + 2 log 81=

3 log 3^2 – 3 log 2 + 2 log 3^4
2 x 3 log 3 – 3 log 2 + 4 x 2 log 3
2 x 1 – 4 x 3 log 3
2 x 1 – 4 x 1
2 – 4
-2