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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/4-(x/x)+5 = 7 // - 7
3/4-(x/x)-7+5 = 0
3/4-7-1+5 = 0
-9/4 = 0
x belongs to the empty set
x belongs to the empty set
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