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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-7 = -3/w // + -3/w
-(-3/w)-7 = 0
3*w^-1-7 = 0
3*w^-1 = 7 // : 3
w^-1 = 7/3
-1 < 0
1/(w^1) = 7/3 // * w^1
1 = 7/3*w^1 // : 7/3
3/7 = w^1
w = 3/7
w = 3/7
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