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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
65 = 10.1/x // - 10.1/x
65-(10.1/x) = 0
65-10.1*x^-1 = 0
-10.1*x^-1 = -65 // : -10.1
x^-1 = 6.43564356
-1 < 0
1/(x^1) = 6.43564356 // * x^1
1 = 6.43564356*x^1 // : 6.43564356
0.15538462 = x^1
x = 0.15538462
x = 0.15538462
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