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v in (-oo:+oo)
60 = -v/2 // + -v/2
60-(-v/2) = 0
(1/2)*v+60 = 0
1/2*v+60 = 0 // - 60
1/2*v = -60 // : 1/2
v = -60/1/2
v = -120
v = -120
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