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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/x = 1 // - 1
1.5/x-1 = 0
1.5*x^-1 = 1 // : 1.5
x^-1 = 0.66666667
-1 < 0
1/(x^1) = 0.66666667 // * x^1
1 = 0.66666667*x^1 // : 0.66666667
1.49999999 = x^1
x = 1.49999999
x = 1.49999999
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