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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-7)/x = 96 // - 96
(x-7)/x-96 = 0
(x-7)/x+(-96*x)/x = 0
x-96*x-7 = 0
-95*x-7 = 0
(-95*x-7)/x = 0
(-95*x-7)/x = 0 // * x
-95*x-7 = 0
-95*x-7 = 0 // + 7
-95*x = 7 // : -95
x = 7/(-95)
x = -7/95
x = -7/95
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