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v in (-oo:+oo)
28 = (-7/4)*v // - (-7/4)*v
28-((-7/4)*v) = 0
(7/4)*v+28 = 0
7/4*v+28 = 0 // - 28
7/4*v = -28 // : 7/4
v = -28/7/4
v = -16
v = -16
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