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v in (-oo:+oo)
14/5 = 9*v-(4*v)-(1/2) // - 9*v-(4*v)-(1/2)
4*v-(9*v)+14/5+1/2 = 0
4*v-9*v+14/5+1/2 = 0
33/10-5*v = 0 // - 33/10
-5*v = -33/10 // : -5
v = -33/10/(-5)
v = 33/50
v = 33/50
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