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v in (-oo:+oo)
4 = (6/5)*v // - (6/5)*v
4-((6/5)*v) = 0
(-6/5)*v+4 = 0
4-6/5*v = 0 // - 4
-6/5*v = -4 // : -6/5
v = -4/(-6/5)
v = 10/3
v = 10/3
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