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v in (-oo:+oo)
42 = -v/8 // + -v/8
42-(-v/8) = 0
(1/8)*v+42 = 0
1/8*v+42 = 0 // - 42
1/8*v = -42 // : 1/8
v = -42/1/8
v = -336
v = -336
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