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v in (-oo:+oo)
-49 = (-7/8)*v // - (-7/8)*v
-((-7/8)*v)-49 = 0
(7/8)*v-49 = 0
7/8*v-49 = 0 // + 49
7/8*v = 49 // : 7/8
v = 49/7/8
v = 56
v = 56
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