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D( u )
3*u+15 = 0
3*u+15 = 0
3*u+15 = 0
3*u+15 = 0 // - 15
3*u = -15 // : 3
u = -15/3
u = -5
u in (-oo:-5) U (-5:+oo)
(2*u)/(3*u+15) = 0
2*u = 0 // : 2
u = 0
u = 0
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