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v in (-oo:+oo)
(-1/2)*v-(5/2) = 7*v-(7/5) // - 7*v-(7/5)
(-1/2)*v-(7*v)-(5/2)+7/5 = 0
(-1/2)*v-7*v-5/2+7/5 = 0
-15/2*v-11/10 = 0 // + 11/10
-15/2*v = 11/10 // : -15/2
v = 11/10/(-15/2)
v = -11/75
v = -11/75
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