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v in (-oo:+oo)
v/4-((5*v)/2) = v/8 // - v/8
v/4-((5*v)/2)-(v/8) = 0
v/4+(-5/2)*v-(v/8) = 0
-19/8*v = 0 // : -19/8
v = 0
v = 0
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