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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/2 = 3.5/x // - 3.5/x
3/2-(3.5/x) = 0
3/2-3.5*x^-1 = 0
-3.5*x^-1 = -3/2 // : -3.5
x^-1 = 0.42857143
-1 < 0
1/(x^1) = 0.42857143 // * x^1
1 = 0.42857143*x^1 // : 0.42857143
2.33333333 = x^1
x = 2.33333333
x = 2.33333333
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