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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)
1.25 = x/(x-2) // - x/(x-2)
1.25-(x/(x-2)) = 0
(-1*x)/(x-2)+1.25 = 0
(-1*x)/(x-2)+(1.25*(x-2))/(x-2) = 0
1.25*(x-2)-1*x = 0
0.25*x-2.5 = 0
(0.25*x-2.5)/(x-2) = 0
(0.25*x-2.5)/(x-2) = 0 // * x-2
0.25*x-2.5 = 0
0.25*x-2.5 = 0 // + 2.5
0.25*x = 2.5 // : 0.25
x = 2.5/0.25
x = 10
x = 10
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