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D( u )
4*u-12 = 0
4*u-12 = 0
4*u-12 = 0
4*u-12 = 0 // + 12
4*u = 12 // : 4
u = 12/4
u = 3
u in (-oo:3) U (3:+oo)
(5*u-7)/(4*u-12) = 0
5*u-7 = 0 // + 7
5*u = 7 // : 5
u = 7/5
u = 7/5
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