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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
(9*x^2-25)/(3*x-5) = 0
9*x^2 = 25 // : 9
x^2 = 25/9
x^2 = 25/9 // ^ 1/2
abs(x) = 5/3
x = 5/3 or x = -5/3
x in { 5/3}
x = -5/3
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