(X+2y)(-3x-y)-(x+y)(x-y)+(x-2y)(-2x+y)
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x(-3x-y) +2y(-3x-y) -x(x-y) +y(x-y) +x(-2x+y) -2y(-2x+y)
-3x² - xy - 6xy - 2y² - x² + xy + xy - y² - 2x² + xy + 4xy
-6x² - xy - 5y²
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