add x cube -xsquare y -xysquare -y cube and x cube -2xsquare y +3xy square +4 y
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Step-by-step explanation:
x³ - x²y - xy² - y³ + x³ - 2x² + 3xy² + 4y
= x³ + x³- x²y- xy²+ 3xy²- y³- 2x²+ 4y
= 2x³- x²y + 2xy²- y³- 2x²+ 4y
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