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D( x )
x-5 = 0
x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 0
x = 0
x in (-oo:0) U (0:5) U (5:+oo)
2/(x-5)+1/x = 0
(2*x)/(x*(x-5))+(1*(x-5))/(x*(x-5)) = 0
1*(x-5)+2*x = 0
3*x-5 = 0
(3*x-5)/(x*(x-5)) = 0
(3*x-5)/(x*(x-5)) = 0 // * x*(x-5)
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x = 5/3
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