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v in (-oo:+oo)
-18 = (-6/7)*v // - (-6/7)*v
-((-6/7)*v)-18 = 0
(6/7)*v-18 = 0
6/7*v-18 = 0 // + 18
6/7*v = 18 // : 6/7
v = 18/6/7
v = 21
v = 21
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