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(5x-1)(x+3)(x-5)(5x+1)=40
We move all terms to the left:
(5x-1)(x+3)(x-5)(5x+1)-(40)=0
We multiply parentheses ..
(+5x^2+15x-1x-3)(x-5)(5x+1)-40=0
We multiply parentheses ..
(+5x^2+15x-1x-3)(+5x^2+x-25x-5)-40=0
We move all terms containing x to the left, all other terms to the right
(+5x^2+15x-1x-3)(+5x^2+x-25x-5)=40
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