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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
2/(3*x-1)-((5*x)/(3*x-1)) = 0
2/(3*x-1)-5*x*(3*x-1)^-1 = 0
2/(3*x-1)+(-5*x)/(3*x-1) = 0
2-5*x = 0
(2-5*x)/(3*x-1) = 0
(2-5*x)/(3*x-1) = 0 // * 3*x-1
2-5*x = 0
2-5*x = 0 // - 2
-5*x = -2 // : -5
x = -2/(-5)
x = 2/5
x = 2/5
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