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D( x )
x+5 = 0
5*x-4 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
5*x-4 = 0
5*x-4 = 0
5*x-4 = 0 // + 4
5*x = 4 // : 5
x = 4/5
x in (-oo:-5) U (-5:4/5) U (4/5:+oo)
8/(5*x-4) = 6/(x+5) // - 6/(x+5)
8/(5*x-4)-(6/(x+5)) = 0
8/(5*x-4)-6*(x+5)^-1 = 0
8/(5*x-4)-6/(x+5) = 0
(8*(x+5))/((5*x-4)*(x+5))+(-6*(5*x-4))/((5*x-4)*(x+5)) = 0
8*(x+5)-6*(5*x-4) = 0
64-22*x = 0
(64-22*x)/((5*x-4)*(x+5)) = 0
(64-22*x)/((5*x-4)*(x+5)) = 0 // * (5*x-4)*(x+5)
64-22*x = 0
64-22*x = 0 // - 64
-22*x = -64 // : -22
x = -64/(-22)
x = 32/11
x = 32/11
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