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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
13/w = 26/w+5 // - 26/w+5
13/w-(26/w)-5 = 0
13/w-26*w^-1-5 = 0
-13*w^-1 = 5 // : -13
w^-1 = -5/13
-1 < 0
1/(w^1) = -5/13 // * w^1
1 = -5/13*w^1 // : -5/13
-13/5 = w^1
w = -13/5
w = -13/5
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