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v in (-oo:+oo)
29/5 = 5*v-(4*v)-(1/2) // - 5*v-(4*v)-(1/2)
4*v-(5*v)+29/5+1/2 = 0
4*v-5*v+29/5+1/2 = 0
63/10-v = 0 // - 63/10
-v = -63/10 // * -1
v = 63/10
v = 63/10
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