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v in (-oo:+oo)
31 = (3*v-2)/7+(8*v+1)/3 // - (3*v-2)/7+(8*v+1)/3
31-((3*v-2)/7)-((8*v+1)/3) = 0
(-1*(3*v-2))/7+(-1*(8*v+1))/3+31 = 0
(-1*3*(3*v-2))/(3*7)+(-1*7*(8*v+1))/(3*7)+(3*7*31)/(3*7) = 0
3*7*31-1*3*(3*v-2)-1*7*(8*v+1) = 0
651-65*v-1 = 0
650-65*v = 0
(650-65*v)/(3*7) = 0
(650-65*v)/(3*7) = 0 // * 3*7
650-65*v = 0
650-65*v = 0 // - 650
-65*v = -650 // : -65
v = -650/(-65)
v = 10
v = 10
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