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