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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
-3 = (y+0)/(x-8) // - (y+0)/(x-8)
-((y+0)/(x-8))-3 = 0
-(y/(x-8))-3 = 0
(-1*y)/(x-8)-3 = 0
(-1*y)/(x-8)+(-3*(x-8))/(x-8) = 0
-3*(x-8)-1*y = 0
24-3*x-y = 0
(24-3*x-y)/(x-8) = 0
(24-3*x-y)/(x-8) = 0 // * x-8
24-3*x-y = 0
24-3*x-y = 0 // - 24-y
-3*x = -(24-y) // : -3
x = (-(24-y))/(-3)
x = (y-24)/(-3)
x = (y-24)/(-3)
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