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5x(5+4x)(2+4x)=0
We add all the numbers together, and all the variables
5x(4x+5)(4x+2)=0
We multiply parentheses ..
5x(+16x^2+8x+20x+10)=0
We multiply parentheses
80x^3+40x^2+100x^2+50x=0
We do not support expression: x^3
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