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v in (-oo:+oo)
-14 = (-2/7)*v // - (-2/7)*v
-((-2/7)*v)-14 = 0
(2/7)*v-14 = 0
2/7*v-14 = 0 // + 14
2/7*v = 14 // : 2/7
v = 14/2/7
v = 49
v = 49
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