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D( x )
3-x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
6 = 5/(3-x) // - 5/(3-x)
6-(5/(3-x)) = 0
6-5*(3-x)^-1 = 0
6-5/(3-x) = 0
(6*(3-x))/(3-x)-5/(3-x) = 0
6*(3-x)-5 = 0
13-6*x = 0
(13-6*x)/(3-x) = 0
(13-6*x)/(3-x) = 0 // * 3-x
13-6*x = 0
13-6*x = 0 // - 13
-6*x = -13 // : -6
x = -13/(-6)
x = 13/6
x = 13/6
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