please give my answer
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(x+2y)(-3x-y)-(x+y)(x-y)+(x-2y)(-2x+y)
=-3x²-xy-6xy-2y²-x²+y²-2x²+xy+4xy-2y²
=-6x²-2xy-3y²
=-(6x²+2xy+3y²)
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