Question 251194
Simplify by removing a factor of 1. 
x^2-4x+3 over x^2+3x-18 
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Factor:
[(x-3)(x-1)] / [(x+6)(x-3)]
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The (x-3)/(x-3) is a "factor of 1"; cancel it out.
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= (x-1)/(x+6)
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Cheers,
Stan H.