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D( x )
3*x-(6/7) = 0
3*x-(6/7) = 0
3*x-(6/7) = 0
3*x-6/7 = 0
3*x-6/7 = 0 // + 6/7
3*x = 6/7 // : 3
x = 6/7/3
x = 2/7
x in (-oo:2/7) U (2/7:+oo)
(5*x-(10/3))/(3*x-(6/7)) = 0
(5*x-10/3)/(3*x-6/7) = 0
5*x-10/3 = 0 // + 10/3
5*x = 10/3 // : 5
x = 10/3/5
x = 2/3
x = 2/3
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