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v in (-oo:+oo)
(2*v)/5+v/4 = 9/5+3/20 // - 9/5+3/20
(2*v)/5+v/4-(9/5)-(3/20) = 0
(2*v)/5+v/4-9/5-3/20 = 0
13/20*v-39/20 = 0 // + 39/20
13/20*v = 39/20 // : 13/20
v = 39/20/13/20
v = 3
v = 3
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