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a in (-oo:+oo)
208 = (1/2)*a^8 // - (1/2)*a^8
208-((1/2)*a^8) = 0
(-1/2)*a^8+208 = 0
-1/2*a^8 = -208 // : -1/2
a^8 = 416
a^8 = 416 // ^ 1/8
abs(a) = 416^(1/8)
a = 416^(1/8) or a = -416^(1/8)
a in { 416^(1/8), -416^(1/8) }
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