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v in (-oo:+oo)
49 = (-7/4)*v // - (-7/4)*v
49-((-7/4)*v) = 0
(7/4)*v+49 = 0
7/4*v+49 = 0 // - 49
7/4*v = -49 // : 7/4
v = -49/7/4
v = -28
v = -28
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