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v in (-oo:+oo)
(9/8)*v = -2/7 // + -2/7
(9/8)*v-(-2/7) = 0
(9/8)*v+2/7 = 0
9/8*v+2/7 = 0 // - 2/7
9/8*v = -2/7 // : 9/8
v = -2/7/9/8
v = -16/63
v = -16/63
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