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x in (-oo:+oo)
(M/(-8))*x = x^3 // - x^3
(M/(-8))*x-x^3 = 0
-1/8*M*x-x^3 = 0
-x*(1/8*M+x^2) = 0
1*x^2 = -(1/8*M) // : 1
x^2 = -1/8*M
x^2 = -1/8*M // ^ 1/2
abs(x) = (-1/8)^(1/2)*M^(1/2)
x = (-1/8)^(1/2)*M^(1/2) or x = -((-1/8)^(1/2)*M^(1/2))
-x = 0
-1*x = 0 // : -1
x = 0
x in { (-1/8)^(1/2)*M^(1/2), -((-1/8)^(1/2)*M^(1/2)), 0 }
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