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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 2/1.25 // - 2/1.25
3/x-(2/1.25) = 0
3/x-1.6 = 0
3*x^-1 = 1.6 // : 3
x^-1 = 0.53333333
-1 < 0
1/(x^1) = 0.53333333 // * x^1
1 = 0.53333333*x^1 // : 0.53333333
1.87500001 = x^1
x = 1.87500001
x = 1.87500001
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