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v in (-oo:+oo)
(2/3)*v-7 = (3/5)*v-(7/3) // - (3/5)*v-(7/3)
(2/3)*v-((3/5)*v)+7/3-7 = 0
(2/3)*v+(-3/5)*v+7/3-7 = 0
1/15*v-14/3 = 0 // + 14/3
1/15*v = 14/3 // : 1/15
v = 14/3/1/15
v = 70
v = 70
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