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D( x )
2*x-38 = 0
2*x-38 = 0
2*x-38 = 0
2*x-38 = 0 // + 38
2*x = 38 // : 2
x = 38/2
x = 19
x in (-oo:19) U (19:+oo)
5/(2*x-38) = 0
x belongs to the empty set
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