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v in (-oo:+oo)
11/2 = 9*v-(5*v)-(1/7) // - 9*v-(5*v)-(1/7)
5*v-(9*v)+11/2+1/7 = 0
5*v-9*v+11/2+1/7 = 0
79/14-4*v = 0 // - 79/14
-4*v = -79/14 // : -4
v = -79/14/(-4)
v = 79/56
v = 79/56
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