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v in (-oo:+oo)
35 = (7/4)*v // - (7/4)*v
35-((7/4)*v) = 0
(-7/4)*v+35 = 0
35-7/4*v = 0 // - 35
-7/4*v = -35 // : -7/4
v = -35/(-7/4)
v = 20
v = 20
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