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v in (-oo:+oo)
(-8*v)/7 = -10 // + 10
(-8*v)/7+10 = 0
10-8/7*v = 0 // - 10
-8/7*v = -10 // : -8/7
v = -10/(-8/7)
v = 35/4
v = 35/4
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