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w in (-oo:+oo)
8-((w^3)/2)+12 = 8 // - 8
8-((w^3)/2)-8+12 = 0
-1/2*w^3 = -12 // : -1/2
w^3 = 24
w^3 = 24 // ^ 1/3
w = 2*3^(1/3)
w = 2*3^(1/3)
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