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v in (-oo:+oo)
-9 = (5/4)*v // - (5/4)*v
-((5/4)*v)-9 = 0
(-5/4)*v-9 = 0
-5/4*v-9 = 0 // + 9
-5/4*v = 9 // : -5/4
v = 9/(-5/4)
v = -36/5
v = -36/5
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