subtract( b3-a3-3ab2-2a2b)-(2b3-a3+5ab2-3a2b)
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(b^3 - a^3 - 3*a*b^2 - 2*a^2*b) - (2*b^3 - a^3 + 5*a*b^2 - 3*a^2*b)
= b^3 - a^3 - 3*a*b^2 - 2*a^2*b - 2*b^3 + a^3 - 5*a*b^2 + 3*a^2*b
= b^3 - 2*b^3 - a^3 + a^3 - 3*a*b^2 - 5*a*b^2 - 2*a^2*b + 3*a^2*b
= -b^3 - 8*a*b^2 + a^2*b ——> Answer
= b^3 - a^3 - 3*a*b^2 - 2*a^2*b - 2*b^3 + a^3 - 5*a*b^2 + 3*a^2*b
= b^3 - 2*b^3 - a^3 + a^3 - 3*a*b^2 - 5*a*b^2 - 2*a^2*b + 3*a^2*b
= -b^3 - 8*a*b^2 + a^2*b ——> Answer
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