Question 86912
[6x^2/10x^3] * [5x/12]
= [3/5] * [5x/12]
= [x/4]
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AND 
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[9/y-6] * [y/5]
Question:
Is the denominator of the 1st fraction "y" or is it "y-6"?
You can avoid this question by properly using parentheses.
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Cheers,
Stan H.