If this is a simple problem for everybody, then there are no difficult problems.

It is simple for those who know how to solve it.

I can solve it in 3 lines only, but can you follow the solution?

[8^6 *3^20 +2^18 *9^10] / 6^19

= [2^18 *3^20 +2^18 *3^20] / 2^19 *3^19

= 2^19 *3^20 / 2^19 *3^19

= 3 --------answer.

Simple for me.

(Maybe, next time, avoid calling any Math problem "simple" so that, I, at least, can explain the solution in details.)