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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20 = 1.06/x-0.06 // - 1.06/x-0.06
0.06-(1.06/x)+20 = 0
0.06-1.06*x^-1+20 = 0
-1.06*x^-1 = -20.06 // : -1.06
x^-1 = 18.9245283
-1 < 0
1/(x^1) = 18.9245283 // * x^1
1 = 18.9245283*x^1 // : 18.9245283
0.05284148 = x^1
x = 0.05284148
x = 0.05284148
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