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v in (-oo:+oo)
(2/3)*v+1/6 = (7/9)*v-(5/6) // - (7/9)*v-(5/6)
(2/3)*v-((7/9)*v)+1/6+5/6 = 0
(2/3)*v+(-7/9)*v+1/6+5/6 = 0
1-1/9*v = 0 // - 1
-1/9*v = -1 // : -1/9
v = -1/(-1/9)
v = 9
v = 9
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