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v in (-oo:+oo)
30 = (3/5)*v // - (3/5)*v
30-((3/5)*v) = 0
(-3/5)*v+30 = 0
30-3/5*v = 0 // - 30
-3/5*v = -30 // : -3/5
v = -30/(-3/5)
v = 50
v = 50
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