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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(x+4)/(x-1)+1 = 5/(x-1) // - 5/(x-1)
(x+4)/(x-1)-(5/(x-1))+1 = 0
(x+4)/(x-1)-5*(x-1)^-1+1 = 0
(x+4)/(x-1)-5/(x-1)+1 = 0
(x+4)/(x-1)-5/(x-1)+(1*(x-1))/(x-1) = 0
1*(x-1)+x-5+4 = 0
x+x-1-1 = 0
2*x-2 = 0
(2*x-2)/(x-1) = 0
(2*x-2)/(x-1) = 0 // * x-1
2*x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x in { 1}
x belongs to the empty set
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