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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/7 = 56/w // - 56/w
2/7-(56/w) = 0
2/7-56*w^-1 = 0
-56*w^-1 = -2/7 // : -56
w^-1 = 1/196
-1 < 0
1/(w^1) = 1/196 // * w^1
1 = 1/196*w^1 // : 1/196
196 = w^1
w = 196
w = 196
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