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v in (-oo:+oo)
5-(8*v) = 3*v-(1/2) // - 3*v-(1/2)
1/2-(8*v)-(3*v)+5 = 0
1/2-8*v-3*v+5 = 0
11/2-11*v = 0 // - 11/2
-11*v = -11/2 // : -11
v = -11/2/(-11)
v = 1/2
v = 1/2
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