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v in (-oo:+oo)
4/7 = -8*v // + -8*v
4/7-(-8*v) = 0
8*v+4/7 = 0
8*v+4/7 = 0 // - 4/7
8*v = -4/7 // : 8
v = -4/7/8
v = -1/14
v = -1/14
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