Question 77535
Add: (5x^2+7y-6z^2),(4y+3x^2), (2y-2x^2)
Add "like" terms: 
5x^2+3x^2-2x^2=6x^2
7y+4y+2y=13y
-6z^2
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6x^2+13y-6z^2
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Cheers,
Stan H.