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D( x )
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
x in (-oo:7/2) U (7/2:+oo)
3/(2*x-7) = 0
x belongs to the empty set
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