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v in (-oo:+oo)
-7/8 = (-7/2)*v-(5/4) // - (-7/2)*v-(5/4)
5/4-((-7/2)*v)-7/8 = 0
(7/2)*v-7/8+5/4 = 0
7/2*v+3/8 = 0 // - 3/8
7/2*v = -3/8 // : 7/2
v = -3/8/7/2
v = -3/28
v = -3/28
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