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x in (-oo:+oo)
(0*x^3)/4 = 0
0 = 0
(0*x^3)/4 = 0 // * 4
0*x^3 = 0
0 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
0*x^3 = 0 <=> 0 = 0 or 0*x^3 = 0 <=> x^3 = 0
x in (-oo:+oo)
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