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D( x )
x-5 = 0
x+5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:5) U (5:+oo)
(x-1)/(x-5)-((x+2)/(x+5)) = 0
(x-1)/(x-5)+(-1*(x+2))/(x+5) = 0
((x-1)*(x+5))/((x-5)*(x+5))+(-1*(x+2)*(x-5))/((x-5)*(x+5)) = 0
(x-1)*(x+5)-1*(x+2)*(x-5) = 0
7*x+5 = 0
(7*x+5)/((x-5)*(x+5)) = 0
(7*x+5)/((x-5)*(x+5)) = 0 // * (x-5)*(x+5)
7*x+5 = 0
7*x+5 = 0 // - 5
7*x = -5 // : 7
x = -5/7
x = -5/7
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