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v in (-oo:+oo)
5/3-((5/2)*v) = -5/7 // + -5/7
5/3-((5/2)*v)-(-5/7) = 0
(-5/2)*v+5/3+5/7 = 0
50/21-5/2*v = 0 // - 50/21
-5/2*v = -50/21 // : -5/2
v = -50/21/(-5/2)
v = 20/21
v = 20/21
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