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(x+1)(x+2)(x-3)=(x-2)(x+1)(x+1)
x^3-7x-6=(x-2)(x+1)^2
x^2-7x-6=x^2-3x-2
x^2-x^2-7x+3x=6-2
-4x=4
x=4/-4
x=-1
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