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v in (-oo:+oo)
(-5/4)*v+4 = (-1/2)*v-(2/3) // - (-1/2)*v-(2/3)
(-5/4)*v-((-1/2)*v)+2/3+4 = 0
(-5/4)*v+(1/2)*v+2/3+4 = 0
14/3-3/4*v = 0 // - 14/3
-3/4*v = -14/3 // : -3/4
v = -14/3/(-3/4)
v = 56/9
v = 56/9
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