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D( x )
4*x-12 = 0
4*x-12 = 0
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x in (-oo:3) U (3:+oo)
(7*x)/(4*x-12) = 0
7*x = 0 // : 7
x = 0
x = 0
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