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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(6/w)-5 = w+2/w+1+7 // - w+2/w+1+7
w-w-(6/w)-(2/w)-7-5-1 = 0
w-w-6*w^-1-2*w^-1-7-5-1 = 0
-8*w^-1 = 13 // : -8
w^-1 = -13/8
-1 < 0
1/(w^1) = -13/8 // * w^1
1 = -13/8*w^1 // : -13/8
-8/13 = w^1
w = -8/13
w = -8/13
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