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v in (-oo:+oo)
(15/14)*v-(3/7) = 2/7 // - 2/7
(15/14)*v-(3/7)-(2/7) = 0
(15/14)*v-3/7-2/7 = 0
15/14*v-5/7 = 0 // + 5/7
15/14*v = 5/7 // : 15/14
v = 5/7/15/14
v = 2/3
v = 2/3
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