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x in (-oo:+oo)
W/8 = -3*x^8 // + -3*x^8
W/8-(-3*x^8) = 0
W/8+3*x^8 = 0
3*x^8 = -(1/8*W) // : 3
x^8 = -1/24*W
x^8 = -1/24*W // ^ 1/8
abs(x) = (-1/24)^(1/8)*W^(1/8)
x = (-1/24)^(1/8)*W^(1/8) or x = -((-1/24)^(1/8)*W^(1/8))
x in { (-1/24)^(1/8)*W^(1/8), -((-1/24)^(1/8)*W^(1/8)) }
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