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y(5x^2+2x)-x(2y-6y^2)

 Sep 11, 2016
 #1
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I figured it out myself, it's 

5x^2y-6xy^2

 Sep 11, 2016
 #2
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y(5x2+2x)x(2y6y2)=5x2y+2xy2xy+6xy2=5x2y+6xy2

.
 Sep 12, 2016

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