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(x+2)*(x^2-2x+4)-x*(x+2)*(x-2)=(x+2)*(x^2-2x+4-x*(x-2))=(x+2)(x^2-2x+4-x^2+2x)=4(x+2)
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(x+2)*(x^2-2x+4)-x*(x+2)*(x-2)=(x+2)*(x^2-2x+4-x*(x-2))=(x+2)(x^2-2x+4-x^2+2x)=4(x+2)