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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7/w = 0.7 // - 0.7
7/w-0.7 = 0
7*w^-1 = 0.7 // : 7
w^-1 = 0.1
-1 < 0
1/(w^1) = 0.1 // * w^1
1 = 0.1*w^1 // : 0.1
10 = w^1
w = 10
w = 10
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