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v in (-oo:+oo)
-8*v = 4/9 // - 4/9
-8*v-(4/9) = 0
-8*v-4/9 = 0
-8*v-4/9 = 0 // + 4/9
-8*v = 4/9 // : -8
v = 4/9/(-8)
v = -1/18
v = -1/18
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