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v in (-oo:+oo)
-7.9 = v/3-3.1 // - v/3-3.1
3.1-(v/3)-7.9 = 0
-1/3*v-4.8 = 0 // + 4.8
-1/3*v = 4.8 // : -1/3
v = 4.8/(-1/3)
v = -14.40000014
v = -14.40000014
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