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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(100*x+11000)/x = 0
100*x+11000 = 0 // - 11000
100*x = -11000 // : 100
x = -11000/100
x = -110
x = -110
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