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D( x )
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:3) U (3:+oo)
23/(2*x-6) = -5 // + 5
23/(2*x-6)+5 = 0
23/(2*x-6)+(5*(2*x-6))/(2*x-6) = 0
5*(2*x-6)+23 = 0
10*x-7 = 0
(10*x-7)/(2*x-6) = 0
(10*x-7)/(2*x-6) = 0 // * 2*x-6
10*x-7 = 0
10*x-7 = 0 // + 7
10*x = 7 // : 10
x = 7/10
x = 7/10
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