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(x-2)(x-4)(x-6)(x-8)=105
We move all terms to the left:
(x-2)(x-4)(x-6)(x-8)-(105)=0
We multiply parentheses ..
(+x^2-4x-2x+8)(x-6)(x-8)-105=0
We multiply parentheses ..
(+x^2-4x-2x+8)(+x^2-8x-6x+48)-105=0
We move all terms containing x to the left, all other terms to the right
(+x^2-4x-2x+8)(+x^2-8x-6x+48)=105
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