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(4x+20)(5x+10)(4x)4x=400
We move all terms to the left:
(4x+20)(5x+10)(4x)4x-(400)=0
We multiply parentheses ..
(+20x^2+40x+100x+200)4x4x-400=0
We multiply parentheses
80x^6+160x^5+400x^5+800x^4-400=0
We do not support expression: x^6
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