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v in (-oo:+oo)
(3*v-9)/10 = (v+3)/7 // - (v+3)/7
(3*v-9)/10-((v+3)/7) = 0
(3*v-9)/10+(-1*(v+3))/7 = 0
(7*(3*v-9))/(7*10)+(-1*10*(v+3))/(7*10) = 0
7*(3*v-9)-1*10*(v+3) = 0
11*v-93 = 0
(11*v-93)/(7*10) = 0
(11*v-93)/(7*10) = 0 // * 7*10
11*v-93 = 0
11*v-93 = 0 // + 93
11*v = 93 // : 11
v = 93/11
v = 93/11
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