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To simplify, be sure to divide the greatest common factor of the
numerator and denominator
42x^3 y
________ factor both numerator and denominator
14xy^3
2*3*7*x*x*x*y
_______________ divide the common factors
2 *7*x*y*y*y
3*x*x
_______
y*y
3x^2
_______
y^2
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