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