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v in (-oo:+oo)
12 = v+7*v-(8/3)+4/5 // - v+7*v-(8/3)+4/5
8/3-v-(7*v)-(4/5)+12 = 0
8/3-v-7*v-4/5+12 = 0
208/15-8*v = 0 // - 208/15
-8*v = -208/15 // : -8
v = -208/15/(-8)
v = 26/15
v = 26/15
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