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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9/w = 25/100 // - 25/100
9/w-(25/100) = 0
9/w-1/4 = 0
9*w^-1 = 1/4 // : 9
w^-1 = 1/36
-1 < 0
1/(w^1) = 1/36 // * w^1
1 = 1/36*w^1 // : 1/36
36 = w^1
w = 36
w = 36
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