Remember, you can always consult the General Guide for Simplifying Fractions Involving Variables reference.

The steps to do solve and simplify the fraction would be:

1. First thing to do, combine the two fractions into one big messy fraction.
   The result would be:
   10*2*X^2X^4Y^7Z^2M^7N^3
   6*5*X^3Y^3Z^3Z^4M^3M^2N
2. Now the best thing to do next is to combine all like terms in the numerator and denominator.
   Now you have:
   20X^6Y^7Z^2M^7N^3
   30X^3Y^3Z^7M^5N
3. Now it is time to simplify the whole expression and, as before, simplifying the constants first is the simplest way. 20/30 would then therefore simplify to 2/3, meaning that a 2 remains on the numerator and a 3 remains on the denominator.
4. Now the more complicated part, simplifying the variables in the fraction.
   1. Arbitrarily I will choose the X to simplify first. (X^6)/(X^3). This simplifies to X^3 (on the numerator).
   2. Next, let's do the Y variable. (Y^7)/(Y^3). This simplifies to Y^4 and this goes in the numerator.
   3. Now, onto the Z variable. (Z^2)/(Z^7). This simplifies to (Z^-5) on the numerator, or Z^5 in the denominator.
   4. Next up is the M variable. (M^7)/(M^5). This simplifies to M^2 on the numerator.
   5. Finally, onto N. (N^3)/(N). This simplifies to N^2 on the numerator.
   6. A combination of all of this would yield (X^3Y^4M^2N^2) on the numerator, with (Z^5) in the denominator.
   7. This is the variable part of the answer.
5. Now with the constant part and the variable part of the answer, all that needs to be done is to combine them.
   This would look like:
   2  *  X^3Y^4M^2N^2
   3                Z^5            
   Or you could have it look like:
   2X^3Y^4M^2N^2
      3Z^5