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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*x+4)/(3*x-1) = 1/2 // - 1/2
(2*x+4)/(3*x-1)-(1/2) = 0
(2*x+4)/(3*x-1)-1/2 = 0
(2*(2*x+4))/(2*(3*x-1))+(-1*(3*x-1))/(2*(3*x-1)) = 0
2*(2*x+4)-1*(3*x-1) = 0
x+9 = 0
(x+9)/(2*(3*x-1)) = 0
(x+9)/(2*(3*x-1)) = 0 // * 2*(3*x-1)
x+9 = 0
x+9 = 0 // - 9
x = -9
x = -9
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