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x in (-oo:+oo)
88 = (0.2*x^3)/2 // - (0.2*x^3)/2
88-((0.2*x^3)/2) = 0
88-0.1*x^3 = 0
-0.1*x^3 = -88 // : -0.1
x^3 = 880
x^3 = 880 // ^ 1/3
x = 2*110^(1/3)
x = 2*110^(1/3)
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