6x⁴+9x³y-4x²y-4y²x+3y³-3y÷2x+3y
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2x−[3y+{5x−(3y−2x)}−2]
=2x−[3y+{5x−3y+2x}−2]
=2x−[3y+7x−3y−2]
=2x−7x+2
=−5x+2
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