Question 257839
[(9y -18)/(6y +12)] *[(3y + 6)/(15y -30)] 
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[(9(y -2))/(6(y +2)] *[(3(y + 2)/(15(y -2)] 
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Cancel any factors that are common to a numerator and a denominator:
[(9)/(6)] *[(3)/(15)] 
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=(3/2)*(1/5)
= 3/10
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Cheers,
stan H.