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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(72-62)/x = 1.89 // - 1.89
(72-62)/x-1.89 = 0
10*x^-1 = 1.89 // : 10
x^-1 = 0.189
-1 < 0
1/(x^1) = 0.189 // * x^1
1 = 0.189*x^1 // : 0.189
5.29100529 = x^1
x = 5.29100529
x = 5.29100529
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