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w in (-oo:+oo)
w^3 = 8/343 // - 8/343
w^3-(8/343) = 0
w^3-8/343 = 0
1*w^3 = 8/343 // : 1
w^3 = 8/343
w^3 = 8/343 // ^ 1/3
w = 2/7
w = 2/7
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