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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.05*x+9000)/x = 0
1.05*x+9000 = 0 // - 9000
1.05*x = -9000 // : 1.05
x = -9000/1.05
x = -8571.42857143
x = -8571.42857143
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