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v in (-oo:+oo)
(5/2)*v-(5/2) = (-7/5)*v-3 // - (-7/5)*v-3
(5/2)*v-((-7/5)*v)-(5/2)+3 = 0
(5/2)*v+(7/5)*v-5/2+3 = 0
39/10*v+1/2 = 0 // - 1/2
39/10*v = -1/2 // : 39/10
v = -1/2/39/10
v = -5/39
v = -5/39
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