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x in (-oo:+oo)
x = (7/6)*x^3 // - (7/6)*x^3
x-((7/6)*x^3) = 0
(-7/6)*x^3+x = 0
x-7/6*x^3 = 0
x*(1-7/6*x^2) = 0
-7/6*x^2 = -1 // : -7/6
x^2 = 6/7
x^2 = 6/7 // ^ 1/2
abs(x) = (6/7)^(1/2)
x = (6/7)^(1/2) or x = -(6/7)^(1/2)
x = 0
x = 0
x in { (6/7)^(1/2), -(6/7)^(1/2), 0 }
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