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D( x )
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0 // - 2
3*x = -2 // : 3
x = -2/3
x in (-oo:-2/3) U (-2/3:+oo)
(2*x-3)/(3*x+2) = 2/5 // - 2/5
(2*x-3)/(3*x+2)-(2/5) = 0
(2*x-3)/(3*x+2)-2/5 = 0
(5*(2*x-3))/(5*(3*x+2))+(-2*(3*x+2))/(5*(3*x+2)) = 0
5*(2*x-3)-2*(3*x+2) = 0
4*x-19 = 0
(4*x-19)/(5*(3*x+2)) = 0
(4*x-19)/(5*(3*x+2)) = 0 // * 5*(3*x+2)
4*x-19 = 0
4*x-19 = 0 // + 19
4*x = 19 // : 4
x = 19/4
x = 19/4
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