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D( x )
x-5 = 0
x-3 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:5) U (5:+oo)
1/(x-3) = 3/(x-5) // - 3/(x-5)
1/(x-3)-(3/(x-5)) = 0
1/(x-3)-3*(x-5)^-1 = 0
1/(x-3)-3/(x-5) = 0
(1*(x-5))/((x-3)*(x-5))+(-3*(x-3))/((x-3)*(x-5)) = 0
1*(x-5)-3*(x-3) = 0
4-2*x = 0
(4-2*x)/((x-3)*(x-5)) = 0
(4-2*x)/((x-3)*(x-5)) = 0 // * (x-3)*(x-5)
4-2*x = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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