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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
22/21 = 550/n // - 550/n
22/21-(550/n) = 0
22/21-550*n^-1 = 0
-550*n^-1 = -22/21 // : -550
n^-1 = 1/525
-1 < 0
1/(n^1) = 1/525 // * n^1
1 = 1/525*n^1 // : 1/525
525 = n^1
n = 525
n = 525
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