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(x+1)(x+3)(x+5)(x+7)=15
We move all terms to the left:
(x+1)(x+3)(x+5)(x+7)-(15)=0
We multiply parentheses ..
(+x^2+3x+x+3)(x+5)(x+7)-15=0
We multiply parentheses ..
(+x^2+3x+x+3)(+x^2+7x+5x+35)-15=0
We move all terms containing x to the left, all other terms to the right
(+x^2+3x+x+3)(+x^2+7x+5x+35)=15
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