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v in (-oo:+oo)
(1/2)*v-(2/7) = -1/5 // + -1/5
(1/2)*v-(2/7)-(-1/5) = 0
(1/2)*v-2/7+1/5 = 0
1/2*v-3/35 = 0 // + 3/35
1/2*v = 3/35 // : 1/2
v = 3/35/1/2
v = 6/35
v = 6/35
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