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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
(7*x-8)/(2*x-4) = 0
7*x-8 = 0 // + 8
7*x = 8 // : 7
x = 8/7
x = 8/7
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