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v in (-oo:+oo)
(-1/4)*v-4 = (5/3)*v-(5/3) // - (5/3)*v-(5/3)
(-1/4)*v-((5/3)*v)+5/3-4 = 0
(-1/4)*v+(-5/3)*v+5/3-4 = 0
-23/12*v-7/3 = 0 // + 7/3
-23/12*v = 7/3 // : -23/12
v = 7/3/(-23/12)
v = -28/23
v = -28/23
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