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v in (-oo:+oo)
-2*v = 14/9 // - 14/9
-2*v-(14/9) = 0
-2*v-14/9 = 0
-2*v-14/9 = 0 // + 14/9
-2*v = 14/9 // : -2
v = 14/9/(-2)
v = -7/9
v = -7/9
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