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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(620/26)/3 = 90/n // - 90/n
(620/26)/3-(90/n) = 0
(620/26)/3-90*n^-1 = 0
-90*n^-1 = -310/39 // : -90
n^-1 = 31/351
-1 < 0
1/(n^1) = 31/351 // * n^1
1 = 31/351*n^1 // : 31/351
351/31 = n^1
n = 351/31
n = 351/31
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