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v in (-oo:+oo)
9 = 3*v+5*v-(6/4)-(4/8) // - 3*v+5*v-(6/4)-(4/8)
6/4-(3*v)-(5*v)+4/8+9 = 0
6/4-3*v-5*v+4/8+9 = 0
11-8*v = 0 // - 11
-8*v = -11 // : -8
v = -11/(-8)
v = 11/8
v = 11/8
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