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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7-8/w = -3 // + 3
3-8/w+7 = 0
-8*w^-1 = -10 // : -8
w^-1 = 5/4
-1 < 0
1/(w^1) = 5/4 // * w^1
1 = 5/4*w^1 // : 5/4
4/5 = w^1
w = 4/5
w = 4/5
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