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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x-1)/x+2 = 8 // - 8
(3*x-1)/x-8+2 = 0
(3*x-1)/x+(-8*x)/x+(2*x)/x = 0
3*x-8*x+2*x-1 = 0
2*x-5*x-1 = 0
-3*x-1 = 0
(-3*x-1)/x = 0
(-3*x-1)/x = 0 // * x
-3*x-1 = 0
-3*x-1 = 0 // + 1
-3*x = 1 // : -3
x = 1/(-3)
x = -1/3
x = -1/3
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