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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.6/22.4 = -2/n // + -2/n
1.6/22.4-(-2/n) = 0
2*n^-1+1.6/22.4 = 0
2*n^-1 = -0.07142857 // : 2
n^-1 = -0.03571429
-1 < 0
1/(n^1) = -0.03571429 // * n^1
1 = -0.03571429*n^1 // : -0.03571429
-27.99999664 = n^1
n = -27.99999664
n = -27.99999664
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