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v in (-oo:+oo)
1/15-((1/6)*v) = 8/15 // - 8/15
1/15-((1/6)*v)-(8/15) = 0
(-1/6)*v+1/15-8/15 = 0
-1/6*v-7/15 = 0 // + 7/15
-1/6*v = 7/15 // : -1/6
v = 7/15/(-1/6)
v = -14/5
v = -14/5
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