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v in (-oo:+oo)
-5/3 = (2/5)*v-(7/4) // - (2/5)*v-(7/4)
7/4-((2/5)*v)-5/3 = 0
(-2/5)*v-5/3+7/4 = 0
1/12-2/5*v = 0 // - 1/12
-2/5*v = -1/12 // : -2/5
v = -1/12/(-2/5)
v = 5/24
v = 5/24
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