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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/x-16 = 10*x // - 10*x
(6*x)/x-(10*x)-16 = 0
(6*x)/x-10*x-16 = 0
-10*x-10 = 0 // + 10
-10*x = 10 // : -10
x = 10/(-10)
x = -1
x = -1
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