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(x−1)(x−2)(x−3)+(x−2)(x−3)(x−4)+(x−3)(x−4)(x−5)+(x−4)(x−5)(x−6)=0
(x−1)(x−2)(x−3)+(x−2)(x−3)(x−4)+(x−3)(x−4)(x−5)+(x−4)(x−5)(x−6)=0
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