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u in (-oo:+oo)
(6*u^1)/2-((3*u^3)/4) = 0
(-3/4)*u^3+(6*u)/2 = 0
3*u-3/4*u^3 = 0
3*u*(1-1/4*u^2) = 0
-1/4*u^2 = -1 // : -1/4
u^2 = 4
u^2 = 4 // ^ 1/2
abs(u) = 2
u = 2 or u = -2
3*u = 0
3*u = 0 // : 3
u = 0
u in { 2, -2, 0 }
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