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D( W )
W = 0
W = 0
W = 0
W in (-oo:0) U (0:+oo)
72/75 = 8/W // - 8/W
72/75-(8/W) = 0
72/75-8*W^-1 = 0
-8*W^-1 = -24/25 // : -8
W^-1 = 3/25
-1 < 0
1/(W^1) = 3/25 // * W^1
1 = 3/25*W^1 // : 3/25
25/3 = W^1
W = 25/3
W = 25/3
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