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v in (-oo:+oo)
-2/7 = (9/8)*v // - (9/8)*v
-((9/8)*v)-2/7 = 0
(-9/8)*v-2/7 = 0
-9/8*v-2/7 = 0 // + 2/7
-9/8*v = 2/7 // : -9/8
v = 2/7/(-9/8)
v = -16/63
v = -16/63
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