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v in (-oo:+oo)
(-8/13)*v = -6/13 // + -6/13
(-8/13)*v-(-6/13) = 0
(-8/13)*v+6/13 = 0
6/13-8/13*v = 0 // - 6/13
-8/13*v = -6/13 // : -8/13
v = -6/13/(-8/13)
v = 3/4
v = 3/4
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