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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
2/(x-5) = 4 // - 4
2/(x-5)-4 = 0
2/(x-5)+(-4*(x-5))/(x-5) = 0
2-4*(x-5) = 0
22-4*x = 0
(22-4*x)/(x-5) = 0
(22-4*x)/(x-5) = 0 // * x-5
22-4*x = 0
22-4*x = 0 // - 22
-4*x = -22 // : -4
x = -22/(-4)
x = 11/2
x = 11/2
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