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posted by Crystal on Friday, March 8, 2013 at 11:20pm.

Subtract(5a^3+3 b^3)-(2a^2b-4ab^2+3b^3+5a^3)=

since there's a 5a^3 + 3b^3 top and bottom, they just disappear, and you are left with -(2a^2b-4ab^2)

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