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x in (-oo:+oo)
(0.1-((3*x)/2))^3 = 0
((-3/2)*x+0.1)^3 = 0
(0.1-3/2*x)^3 = 0
0.1-3/2*x = 0 // - 0.1
-3/2*x = -0.1 // : -3/2
x = -0.1/(-3/2)
x = 0.06666667
x in { 0.06666667, 0.06666667, 0.06666667 }
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