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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/2 = 0.1/x // - 0.1/x
1.5/2-(0.1/x) = 0
1.5/2-0.1*x^-1 = 0
-0.1*x^-1 = -0.75 // : -0.1
x^-1 = 7.5
-1 < 0
1/(x^1) = 7.5 // * x^1
1 = 7.5*x^1 // : 7.5
0.13333333 = x^1
x = 0.13333333
x = 0.13333333
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