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v in (-oo:+oo)
v+v+3/4-(2/5) = v-(5/10)+2 // - v-(5/10)+2
v+v-v+3/4-(2/5)+5/10-2 = 0
v+v-v+3/4-2/5+5/10-2 = 0
v-23/20 = 0 // + 23/20
v = 23/20
v = 23/20
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