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v in (-oo:+oo)
3 = (9*v-6)/7+(3*v-9)/2 // - (9*v-6)/7+(3*v-9)/2
3-((9*v-6)/7)-((3*v-9)/2) = 0
(-1*(9*v-6))/7+(-1*(3*v-9))/2+3 = 0
(-1*2*(9*v-6))/(2*7)+(-1*7*(3*v-9))/(2*7)+(2*3*7)/(2*7) = 0
2*3*7-1*2*(9*v-6)-1*7*(3*v-9) = 0
42-39*v+75 = 0
117-39*v = 0
(117-39*v)/(2*7) = 0
(117-39*v)/(2*7) = 0 // * 2*7
117-39*v = 0
117-39*v = 0 // - 117
-39*v = -117 // : -39
v = -117/(-39)
v = 3
v = 3
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