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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-2 = 5-7/w // - 5-7/w
-(-7/w)-5-2 = 0
7*w^-1-5-2 = 0
7*w^-1 = 7 // : 7
w^-1 = 1
-1 < 0
1/(w^1) = 1 // * w^1
1 = 1*w^1 // : 1
1 = w^1
w = 1
w = 1
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