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(3/4)*x^4-(6*x) = 0
(3/4)*x^4-6*x = 0
3/4*x^4-6*x = 0
3*x*(1/4*x^3-2) = 0
1/4*x^3 = 2 // : 1/4
x^3 = 8
x^3 = 8 // ^ 1/3
x = 2
3*x = 0
3*x = 0 // : 3
x = 0
x in { 2, 0 }
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