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v in (-oo:+oo)
(-2/7)*v = 3 // - 3
(-2/7)*v-3 = 0
-2/7*v-3 = 0 // + 3
-2/7*v = 3 // : -2/7
v = 3/(-2/7)
v = -21/2
v = -21/2
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