subtract X ^ 4 + 3 X ^ 3 y ^ 3 +5 y ^ 4 from 2 X ^ 4 - x ^ 3 y ^ 3 + 7 y ^ 4
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2 X ^ 4 - x ^3 y ^ 3 + 7 y ^ 4 - ( X ^ 4 + 3 X ^ 3 y ^ 3 +5 y ^ 4)
= 2 X ^ 4 - x ^3 y ^ 3 + 7 y ^ 4 - X ^ 4 - 3 X ^ 3 y ^ 3 - 5 y ^ 4
= x^4 - 4x^3y^3 + 2y^4
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