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D( x )
5*x-6 = 0
5*x-6 = 0
5*x-6 = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
x in (-oo:6/5) U (6/5:+oo)
(2*x^2+8)/(5*x-6) = 0
2*x^2 = -8 // : 2
x^2 = -4
x belongs to the empty set
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