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Lets work the top first ...
multiply the co-efficients ... 3 * 2 = 6
multiply the x terms ... x^2 * x^4 = x^6
multiply the m terms ... m^5 * m^2 = m^7
Now lets work the bottom
Multiply the m terms ... m^5 * m^-4 = m^1 = m
Reduce
Divide the coefficients ... 6/3 =2
Divide the x terms ... x^6 / x^2 = x^4
Divide the m terms ... m^7 / m = m^6