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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
112/x = 15 // - 15
112/x-15 = 0
112*x^-1 = 15 // : 112
x^-1 = 15/112
-1 < 0
1/(x^1) = 15/112 // * x^1
1 = 15/112*x^1 // : 15/112
112/15 = x^1
x = 112/15
x = 112/15
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