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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
18/(x-2)+4 = y // - y
18/(x-2)-y+4 = 0
18/(x-2)+(-y*(x-2))/(x-2)+(4*(x-2))/(x-2) = 0
4*(x-2)-y*(x-2)+18 = 0
4*x-(x*y)+2*y-8+18 = 0
4*x-(x*y)+2*y+10 = 0
(4*x-(x*y)+2*y+10)/(x-2) = 0
(4*x-(x*y)+2*y+10)/(x-2) = 0 // * x-2
4*x-(x*y)+2*y+10 = 0
4*x+2*y+10 = 0 // - 2*y+10
4*x = -(2*y+10) // : 4
x = (-(2*y+10))/4
x = (-(2*y+10))/4
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