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x in (-oo:+oo)
x/3 = 42*x^3 // - 42*x^3
x/3-(42*x^3) = 0
x/3-42*x^3 = 0
1/3*x-42*x^3 = 0
x*(1/3-42*x^2) = 0
-42*x^2 = -1/3 // : -42
x^2 = 1/126
x^2 = 1/126 // ^ 1/2
abs(x) = (1/126)^(1/2)
x = (1/126)^(1/2) or x = -(1/126)^(1/2)
x = 0
x = 0
x in { (1/126)^(1/2), -(1/126)^(1/2), 0 }
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