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v in (-oo:+oo)
-1/2 = (2/3)*v-(2/7) // - (2/3)*v-(2/7)
2/7-((2/3)*v)-1/2 = 0
(-2/3)*v-1/2+2/7 = 0
-2/3*v-3/14 = 0 // + 3/14
-2/3*v = 3/14 // : -2/3
v = 3/14/(-2/3)
v = -9/28
v = -9/28
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