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D( x )
12*x-9 = 0
12*x-9 = 0
12*x-9 = 0
12*x-9 = 0 // + 9
12*x = 9 // : 12
x = 9/12
x = 3/4
x in (-oo:3/4) U (3/4:+oo)
15/(12*x-9) = 0
x belongs to the empty set
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