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v in (-oo:+oo)
12/7 = -4*v // + -4*v
12/7-(-4*v) = 0
4*v+12/7 = 0
4*v+12/7 = 0 // - 12/7
4*v = -12/7 // : 4
v = -12/7/4
v = -3/7
v = -3/7
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