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v in (-oo:+oo)
35 = (7/3)*v // - (7/3)*v
35-((7/3)*v) = 0
(-7/3)*v+35 = 0
35-7/3*v = 0 // - 35
-7/3*v = -35 // : -7/3
v = -35/(-7/3)
v = 15
v = 15
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