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D( v )
v-5 = 0
v-5 = 0
v-5 = 0
v-5 = 0 // + 5
v = 5
v in (-oo:5) U (5:+oo)
4/(v-5) = -3 // + 3
4/(v-5)+3 = 0
4/(v-5)+(3*(v-5))/(v-5) = 0
3*(v-5)+4 = 0
3*v-11 = 0
(3*v-11)/(v-5) = 0
(3*v-11)/(v-5) = 0 // * v-5
3*v-11 = 0
3*v-11 = 0 // + 11
3*v = 11 // : 3
v = 11/3
v = 11/3
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