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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
60/132 = 5/u // - 5/u
60/132-(5/u) = 0
60/132-5*u^-1 = 0
-5*u^-1 = -5/11 // : -5
u^-1 = 1/11
-1 < 0
1/(u^1) = 1/11 // * u^1
1 = 1/11*u^1 // : 1/11
11 = u^1
u = 11
u = 11
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