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x in (-oo:+oo)
m = (3/8)*x^4 // - (3/8)*x^4
m-((3/8)*x^4) = 0
m+(-3/8)*x^4 = 0
-3/8*x^4 = -m // : -3/8
x^4 = 8/3*m
x^4 = 8/3*m // ^ 1/4
abs(x) = (8/3)^(1/4)*m^(1/4)
x = (8/3)^(1/4)*m^(1/4) or x = -((8/3)^(1/4)*m^(1/4))
x in { (8/3)^(1/4)*m^(1/4), -((8/3)^(1/4)*m^(1/4)) }
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