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D( v )
3*v-5 = 0
3*v-5 = 0
3*v-5 = 0
3*v-5 = 0 // + 5
3*v = 5 // : 3
v = 5/3
v in (-oo:5/3) U (5/3:+oo)
(v-9)/(3*v-5) = 0
v-9 = 0 // + 9
v = 9
v = 9
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