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v in (-oo:+oo)
(3*v)/10-((5*v)/6) = (8*v)/15 // - (8*v)/15
(3*v)/10-((5*v)/6)-((8*v)/15) = 0
(3*v)/10+(-5/6)*v+(-8/15)*v = 0
-16/15*v = 0 // : -16/15
v = 0
v = 0
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