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v in (-oo:+oo)
v+2/7+3/7 = (-1/7)*(v-(5/2)) // - (-1/7)*(v-(5/2))
v-((-1/7)*(v-(5/2)))+2/7+3/7 = 0
(1/7)*(v-5/2)+v+2/7+3/7 = 0
1/7*(v-5/2)+v+2/7+3/7 = 0
(1/7*7*(v-5/2))/7+(7*v)/7+2/7+3/7 = 0
1/7*7*(v-5/2)+7*v+2+3 = 0
8*v-5/2+2+3 = 0
8*v-1/2+3 = 0
8*v+5/2 = 0
(8*v+5/2)/7 = 0
(8*v+5/2)/7 = 0 // * 7
8*v+5/2 = 0
8*v+5/2 = 0 // - 5/2
8*v = -5/2 // : 8
v = -5/2/8
v = -5/16
v = -5/16
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