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