The solution idea is 1, because the denominator on the right side of the equation is 27, so the 2 on the left side of the equation will definitely be eliminated. So m = N. Then there is 3/9= 1/3 left in brackets, so m=n = 3. Substitute the values of m and n into the equation to be solved, and you can get 4.

Idea 2: According to the idea 1, if m=n, the equation to be solved can be simplified as (3m+m)/(2m-m)=4m/m=4.

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