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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)
(x^2-36)/(3*x-2) = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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