(x+2y)(x-2y)-(2x-y)(-2x-y)=x^2-4y^2-(-4x^2+y^2)=5x^2-5y^2=5(x^2-y^2)=5(x+y)(x-y)
(x+2y)(x-2y)-(2x-y)(-2x-y)
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