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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.125/x+1 = 0
0.125*x^-1 = -1 // : 0.125
x^-1 = -8
-1 < 0
1/(x^1) = -8 // * x^1
1 = -8*x^1 // : -8
-1/8 = x^1
x = -1/8
x = -1/8
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