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x in (-oo:+oo)
0 = x*((2020*x^2)/4) // - x*((2020*x^2)/4)
0-(x*((2020*x^2)/4)) = 0
-505*x^3 = 0
-505*x^3 = 0 // : -505
x^3 = 0
x = 0
x = 0
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