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v in (-oo:+oo)
(1/7)*(v+1/4) = -5/2 // + -5/2
(1/7)*(v+1/4)-(-5/2) = 0
(1/7)*(v+1/4)+5/2 = 0
1/7*(v+1/4)+5/2 = 0
(1/7*2*(v+1/4))/2+5/2 = 0
1/7*2*(v+1/4)+5 = 0
2/7*v+71/14 = 0
(2/7*v+71/14)/2 = 0
(2/7*v+71/14)/2 = 0 // * 2
2/7*v+71/14 = 0
2/7*v+71/14 = 0 // - 71/14
2/7*v = -71/14 // : 2/7
v = -71/14/2/7
v = -71/4
v = -71/4
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