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v in (-oo:+oo)
(-1/3)*v-(2/7) = 1/2 // - 1/2
(-1/3)*v-(2/7)-(1/2) = 0
(-1/3)*v-2/7-1/2 = 0
-1/3*v-11/14 = 0 // + 11/14
-1/3*v = 11/14 // : -1/3
v = 11/14/(-1/3)
v = -33/14
v = -33/14
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