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v in (-oo:+oo)
(7*v)/10-3 = (3*v)/4 // - (3*v)/4
(7*v)/10-((3*v)/4)-3 = 0
(7*v)/10+(-3/4)*v-3 = 0
-1/20*v-3 = 0 // + 3
-1/20*v = 3 // : -1/20
v = 3/(-1/20)
v = -60
v = -60
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