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D( x )
3*x-1 = 0
x-3 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:1/3) U (1/3:3) U (3:+oo)
8/(3*x-1) = 5/(x-3) // - 5/(x-3)
8/(3*x-1)-(5/(x-3)) = 0
8/(3*x-1)-5*(x-3)^-1 = 0
8/(3*x-1)-5/(x-3) = 0
(8*(x-3))/((3*x-1)*(x-3))+(-5*(3*x-1))/((3*x-1)*(x-3)) = 0
8*(x-3)-5*(3*x-1) = 0
-7*x-19 = 0
(-7*x-19)/((3*x-1)*(x-3)) = 0
(-7*x-19)/((3*x-1)*(x-3)) = 0 // * (3*x-1)*(x-3)
-7*x-19 = 0
-7*x-19 = 0 // + 19
-7*x = 19 // : -7
x = 19/(-7)
x = -19/7
x = -19/7
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