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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-(5/w-5) = -7 // + 7
5-(5/w)+7 = 0
5-5*w^-1+7 = 0
-5*w^-1 = -12 // : -5
w^-1 = 12/5
-1 < 0
1/(w^1) = 12/5 // * w^1
1 = 12/5*w^1 // : 12/5
5/12 = w^1
w = 5/12
w = 5/12
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