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v in (-oo:+oo)
3*v-(2/8) = 20-(9*v)-(3/4) // - 20-(9*v)-(3/4)
3*v+9*v-(2/8)+3/4-20 = 0
3*v+9*v-1/4+3/4-20 = 0
12*v-39/2 = 0 // + 39/2
12*v = 39/2 // : 12
v = 39/2/12
v = 13/8
v = 13/8
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