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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
108/x+23 = 0
108*x^-1 = -23 // : 108
x^-1 = -23/108
-1 < 0
1/(x^1) = -23/108 // * x^1
1 = -23/108*x^1 // : -23/108
-108/23 = x^1
x = -108/23
x = -108/23
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