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v in (-oo:+oo)
-2*v = -3/7 // + -3/7
-2*v-(-3/7) = 0
3/7-2*v = 0
3/7-2*v = 0 // - 3/7
-2*v = -3/7 // : -2
v = -3/7/(-2)
v = 3/14
v = 3/14
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