x^2-2y^2-xy+3x+3y=(x^2-xy-2y^2)+(3x+3y)=(x-2y)(x+y)+3(x+y)=(x-2y+3)(x+y)
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x^2-2y^2-xy+3x+3y=(x^2-xy-2y^2)+(3x+3y)=(x-2y)(x+y)+3(x+y)=(x-2y+3)(x+y)