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v in (-oo:+oo)
(-8/7)*v = 8/3 // - 8/3
(-8/7)*v-(8/3) = 0
(-8/7)*v-8/3 = 0
-8/7*v-8/3 = 0 // + 8/3
-8/7*v = 8/3 // : -8/7
v = 8/3/(-8/7)
v = -7/3
v = -7/3
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