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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)
4/(x-8) = 8/2 // - 8/2
4/(x-8)-(8/2) = 0
4/(x-8)-4 = 0
4/(x-8)+(-4*(x-8))/(x-8) = 0
4-4*(x-8) = 0
36-4*x = 0
(36-4*x)/(x-8) = 0
(36-4*x)/(x-8) = 0 // * x-8
36-4*x = 0
36-4*x = 0 // - 36
-4*x = -36 // : -4
x = -36/(-4)
x = 9
x = 9
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