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D( x )
x-6 = 0
x+5 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:6) U (6:+oo)
(x-3)/(x-6) = (x+1)/(x+5) // - (x+1)/(x+5)
(x-3)/(x-6)-((x+1)/(x+5)) = 0
(x-3)/(x-6)+(-1*(x+1))/(x+5) = 0
((x-3)*(x+5))/((x-6)*(x+5))+(-1*(x+1)*(x-6))/((x-6)*(x+5)) = 0
(x-3)*(x+5)-1*(x+1)*(x-6) = 0
7*x-9 = 0
(7*x-9)/((x-6)*(x+5)) = 0
(7*x-9)/((x-6)*(x+5)) = 0 // * (x-6)*(x+5)
7*x-9 = 0
7*x-9 = 0 // + 9
7*x = 9 // : 7
x = 9/7
x = 9/7
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