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v in (-oo:+oo)
35 = (-5/3)*v // - (-5/3)*v
35-((-5/3)*v) = 0
(5/3)*v+35 = 0
5/3*v+35 = 0 // - 35
5/3*v = -35 // : 5/3
v = -35/5/3
v = -21
v = -21
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