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D( x )
6-x = 0
6-x = 0
6-x = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x in (-oo:6) U (6:+oo)
8/6 = (3*x)/(6-x) // - (3*x)/(6-x)
8/6-((3*x)/(6-x)) = 0
8/6-3*x*(6-x)^-1 = 0
(-3*x)/(6-x)+4/3 = 0
(-3*3*x)/(3*(6-x))+(4*(6-x))/(3*(6-x)) = 0
4*(6-x)-3*3*x = 0
24-13*x = 0
(24-13*x)/(3*(6-x)) = 0
(24-13*x)/(3*(6-x)) = 0 // * 3*(6-x)
24-13*x = 0
24-13*x = 0 // - 24
-13*x = -24 // : -13
x = -24/(-13)
x = 24/13
x = 24/13
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