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v in (-oo:+oo)
5/2-4*v = (-7/5)*v-(3/2) // - (-7/5)*v-(3/2)
5/2-4*v-((-7/5)*v)+3/2 = 0
(7/5)*v-4*v+5/2+3/2 = 0
4-13/5*v = 0 // - 4
-13/5*v = -4 // : -13/5
v = -4/(-13/5)
v = 20/13
v = 20/13
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