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= 8x³ + 36x²y +54xy² + 27y³ - (27x³ - 54x²y + 36xy² -8y³) =
= 8x³ + 36x²y + 54xy² + 27y³ - 27x³ + 54x²y - 36xy² + 8y³ =
= - 19x³ + 35y³ + 90x²y + 18xy²