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To write an expression in simplest form, be sure to divide the greatest common
factor.
-15x^3y^3
____________
-20xy^4
-1*3*5*x*x*x*y*y*y
____________________ divide the common fators
-1*4*5*x*y*y*y*y
3*x*x
_________
4*y
3x^2
_______
4y
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