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v in (-oo:+oo)
-15 = (5/6)*v // - (5/6)*v
-((5/6)*v)-15 = 0
(-5/6)*v-15 = 0
-5/6*v-15 = 0 // + 15
-5/6*v = 15 // : -5/6
v = 15/(-5/6)
v = -18
v = -18
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