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v in (-oo:+oo)
25 = -v/8 // + -v/8
25-(-v/8) = 0
(1/8)*v+25 = 0
1/8*v+25 = 0 // - 25
1/8*v = -25 // : 1/8
v = -25/1/8
v = -200
v = -200
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