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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9/w-(4/w) = 35 // - 35
9/w-(4/w)-35 = 0
9/w-4*w^-1-35 = 0
5*w^-1 = 35 // : 5
w^-1 = 7
-1 < 0
1/(w^1) = 7 // * w^1
1 = 7*w^1 // : 7
1/7 = w^1
w = 1/7
w = 1/7
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