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(2x+40)(2x+40)(2x+60)(2x+60)=2400
We move all terms to the left:
(2x+40)(2x+40)(2x+60)(2x+60)-(2400)=0
We multiply parentheses ..
(+4x^2+80x+80x+1600)(2x+60)(2x+60)-2400=0
We multiply parentheses ..
(+4x^2+80x+80x+1600)(+4x^2+120x+120x+3600)-2400=0
We move all terms containing x to the left, all other terms to the right
(+4x^2+80x+80x+1600)(+4x^2+120x+120x+3600)=2400
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