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w in (-oo:+oo)
(w^1)/3 = -5 // + 5
(w^1)/3+5 = 0
w/3+5 = 0
1/3*w+5 = 0 // - 5
1/3*w = -5 // : 1/3
w = -5/1/3
w = -15
w = -15
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