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v in (-oo:+oo)
30 = (2/5)*v // - (2/5)*v
30-((2/5)*v) = 0
(-2/5)*v+30 = 0
30-2/5*v = 0 // - 30
-2/5*v = -30 // : -2/5
v = -30/(-2/5)
v = 75
v = 75
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