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D( x )
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in (-oo:2) U (2:+oo)
x/(3*x-6)+1/8 = 0
(8*x)/(8*(3*x-6))+(1*(3*x-6))/(8*(3*x-6)) = 0
1*(3*x-6)+8*x = 0
11*x-6 = 0
(11*x-6)/(8*(3*x-6)) = 0
(11*x-6)/(8*(3*x-6)) = 0 // * 8*(3*x-6)
11*x-6 = 0
11*x-6 = 0 // + 6
11*x = 6 // : 11
x = 6/11
x = 6/11
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