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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)
4/(3*x-1) = 10 // - 10
4/(3*x-1)-10 = 0
4/(3*x-1)+(-10*(3*x-1))/(3*x-1) = 0
4-10*(3*x-1) = 0
14-30*x = 0
(14-30*x)/(3*x-1) = 0
(14-30*x)/(3*x-1) = 0 // * 3*x-1
14-30*x = 0
14-30*x = 0 // - 14
-30*x = -14 // : -30
x = -14/(-30)
x = 7/15
x = 7/15
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