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D( x )
7*x-30 = 0
7*x-30 = 0
7*x-30 = 0
7*x-30 = 0 // + 30
7*x = 30 // : 7
x = 30/7
x in (-oo:30/7) U (30/7:+oo)
50/(7*x-30) = 0
x belongs to the empty set
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