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