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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7 = -3/w-1 // + -3/w-1
1-(-3/w)+7 = 0
3*w^-1+1+7 = 0
3*w^-1 = -8 // : 3
w^-1 = -8/3
-1 < 0
1/(w^1) = -8/3 // * w^1
1 = -8/3*w^1 // : -8/3
-3/8 = w^1
w = -3/8
w = -3/8
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