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W in (-oo:+oo)
(W^5)/7 = 40.5 // - 40.5
(W^5)/7-40.5 = 0
1/7*W^5 = 40.5 // : 1/7
W^5 = 283.50000567
W^5 = 283.50000567 // ^ 1/5
W = 283.50000567^(1/5)
W = 283.50000567^(1/5)
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