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3*x^3-((3/4)*x) = 0
3*x^3+(-3/4)*x = 0
3*x^3-3/4*x = 0
3*x*(x^2-1/4) = 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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