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v in (-oo:+oo)
-13 = 8*v-(9*v)-(4/3)-(6/2) // - 8*v-(9*v)-(4/3)-(6/2)
9*v-(8*v)+4/3+6/2-13 = 0
9*v-8*v+4/3+6/2-13 = 0
v-26/3 = 0 // + 26/3
v = 26/3
v = 26/3
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