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v in (-oo:+oo)
30 = (5/3)*v // - (5/3)*v
30-((5/3)*v) = 0
(-5/3)*v+30 = 0
30-5/3*v = 0 // - 30
-5/3*v = -30 // : -5/3
v = -30/(-5/3)
v = 18
v = 18
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