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(x-3)(x+9)(x+5)(x-7)-385=0
We multiply parentheses ..
(+x^2+9x-3x-27)(x+5)(x-7)-385=0
We multiply parentheses ..
(+x^2+9x-3x-27)(+x^2-7x+5x-35)-385=0
We move all terms containing x to the left, all other terms to the right
(+x^2+9x-3x-27)(+x^2-7x+5x-35)=385
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