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x in (-oo:+oo)
(3/4)*x = x^13 // - x^13
(3/4)*x-x^13 = 0
3/4*x-x^13 = 0
x*(3/4-x^12) = 0
-1*x^12 = -3/4 // : -1
x^12 = 3/4
x^12 = 3/4 // ^ 1/12
abs(x) = (3/4)^(1/12)
x = (3/4)^(1/12) or x = -(3/4)^(1/12)
x = 0
x = 0
x in { (3/4)^(1/12), -(3/4)^(1/12), 0 }
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