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D( x )
3*x-1 = 0
7*x-2 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0 // + 2
7*x = 2 // : 7
x = 2/7
x in (-oo:2/7) U (2/7:1/3) U (1/3:+oo)
3/(7*x-2) = 9/(3*x-1) // - 9/(3*x-1)
3/(7*x-2)-(9/(3*x-1)) = 0
3/(7*x-2)-9*(3*x-1)^-1 = 0
3/(7*x-2)-9/(3*x-1) = 0
(3*(3*x-1))/((7*x-2)*(3*x-1))+(-9*(7*x-2))/((7*x-2)*(3*x-1)) = 0
3*(3*x-1)-9*(7*x-2) = 0
15-54*x = 0
(15-54*x)/((7*x-2)*(3*x-1)) = 0
(15-54*x)/((7*x-2)*(3*x-1)) = 0 // * (7*x-2)*(3*x-1)
15-54*x = 0
15-54*x = 0 // - 15
-54*x = -15 // : -54
x = -15/(-54)
x = 5/18
x = 5/18
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