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v in (-oo:+oo)
(-1/2)*v-(3/5) = -6/7 // + -6/7
(-1/2)*v-(3/5)-(-6/7) = 0
(-1/2)*v-3/5+6/7 = 0
9/35-1/2*v = 0 // - 9/35
-1/2*v = -9/35 // : -1/2
v = -9/35/(-1/2)
v = 18/35
v = 18/35
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