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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-9/n = -0.7/2.1 // + -0.7/2.1
-9/n-(-0.7/2.1) = 0
0.33333333-9/n = 0
-9*n^-1 = -0.33333333 // : -9
n^-1 = 0.03703704
-1 < 0
1/(n^1) = 0.03703704 // * n^1
1 = 0.03703704*n^1 // : 0.03703704
26.99999784 = n^1
n = 26.99999784
n = 26.99999784
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