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v in (-oo:+oo)
9 = 8*v+5*v-(5/3)+1/6 // - 8*v+5*v-(5/3)+1/6
5/3-(8*v)-(5*v)-(1/6)+9 = 0
5/3-8*v-5*v-1/6+9 = 0
21/2-13*v = 0 // - 21/2
-13*v = -21/2 // : -13
v = -21/2/(-13)
v = 21/26
v = 21/26
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