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v in (-oo:+oo)
1/3-7*v = (-1/3)*v-(5/2) // - (-1/3)*v-(5/2)
1/3-7*v-((-1/3)*v)+5/2 = 0
(1/3)*v-7*v+1/3+5/2 = 0
17/6-20/3*v = 0 // - 17/6
-20/3*v = -17/6 // : -20/3
v = -17/6/(-20/3)
v = 17/40
v = 17/40
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