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D( x )
x-3 = 0
x-4 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:3) U (3:4) U (4:+oo)
8/(x-3) = 11/(x-4) // - 11/(x-4)
8/(x-3)-(11/(x-4)) = 0
8/(x-3)-11*(x-4)^-1 = 0
8/(x-3)-11/(x-4) = 0
(8*(x-4))/((x-3)*(x-4))+(-11*(x-3))/((x-3)*(x-4)) = 0
8*(x-4)-11*(x-3) = 0
1-3*x = 0
(1-3*x)/((x-3)*(x-4)) = 0
(1-3*x)/((x-3)*(x-4)) = 0 // * (x-3)*(x-4)
1-3*x = 0
1-3*x = 0 // - 1
-3*x = -1 // : -3
x = -1/(-3)
x = 1/3
x = 1/3
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