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v in (-oo:+oo)
13/4 = (11/2)*v-2 // - (11/2)*v-2
13/4-((11/2)*v)+2 = 0
(-11/2)*v+13/4+2 = 0
21/4-11/2*v = 0 // - 21/4
-11/2*v = -21/4 // : -11/2
v = -21/4/(-11/2)
v = 21/22
v = 21/22
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