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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/x-(110/x)-5 = -1/5 // + -1/5
100/x-(110/x)-(-1/5)-5 = 0
100/x-110*x^-1+1/5-5 = 0
-10*x^-1 = 24/5 // : -10
x^-1 = -12/25
-1 < 0
1/(x^1) = -12/25 // * x^1
1 = -12/25*x^1 // : -12/25
-25/12 = x^1
x = -25/12
x = -25/12
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