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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
130/u = 5 // - 5
130/u-5 = 0
130*u^-1 = 5 // : 130
u^-1 = 1/26
-1 < 0
1/(u^1) = 1/26 // * u^1
1 = 1/26*u^1 // : 1/26
26 = u^1
u = 26
u = 26
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