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x in (-oo:+oo)
M = (1/5)*x^8 // - (1/5)*x^8
M-((1/5)*x^8) = 0
M+(-1/5)*x^8 = 0
-1/5*x^8 = -M // : -1/5
x^8 = 5*M
x^8 = 5*M // ^ 1/8
abs(x) = 5^(1/8)*M^(1/8)
x = 5^(1/8)*M^(1/8) or x = -(5^(1/8)*M^(1/8))
x in { 5^(1/8)*M^(1/8), -(5^(1/8)*M^(1/8)) }
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