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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)
(x+6)/(x-5)+1 = 11/(x-5) // - 11/(x-5)
(x+6)/(x-5)-(11/(x-5))+1 = 0
(x+6)/(x-5)-11*(x-5)^-1+1 = 0
(x+6)/(x-5)-11/(x-5)+1 = 0
(x+6)/(x-5)-11/(x-5)+(1*(x-5))/(x-5) = 0
1*(x-5)+x-11+6 = 0
x+x-5-5 = 0
2*x-10 = 0
(2*x-10)/(x-5) = 0
(2*x-10)/(x-5) = 0 // * x-5
2*x-10 = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x in { 5}
x belongs to the empty set
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