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v in (-oo:+oo)
2/3-((1/2)*v) = -7/4 // + -7/4
2/3-((1/2)*v)-(-7/4) = 0
(-1/2)*v+2/3+7/4 = 0
29/12-1/2*v = 0 // - 29/12
-1/2*v = -29/12 // : -1/2
v = -29/12/(-1/2)
v = 29/6
v = 29/6
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