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x in (-oo:+oo)
(3/4)*x = (12*x^3)/4 // - (12*x^3)/4
(3/4)*x-((12*x^3)/4) = 0
(3/4)*x-3*x^3 = 0
3/4*x-3*x^3 = 0
3*x*(1/4-x^2) = 0
-1*x^2 = -1/4 // : -1
x^2 = 1/4
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
3*x = 0
3*x = 0 // : 3
x = 0
x in { 1/2, -1/2, 0 }
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