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v in (-oo:+oo)
(1/7)*(v+1/4) = 2*((3*v)/2-(5/2)) // - 2*((3*v)/2-(5/2))
(1/7)*(v+1/4)-(2*((3*v)/2-(5/2))) = 0
(1/7)*(v+1/4)-2*((3*v)/2-5/2) = 0
1/7*(v+1/4)-2*(3/2*v-5/2) = 0
1/7*(v+1/4)-2*(3/2*v-5/2) = 0
141/28-20/7*v = 0
141/28-20/7*v = 0
141/28-20/7*v = 0 // - 141/28
-20/7*v = -141/28 // : -20/7
v = -141/28/(-20/7)
v = 141/80
v = 141/80
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