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v in (-oo:+oo)
-8*v = -9/2 // + -9/2
-8*v-(-9/2) = 0
9/2-8*v = 0
9/2-8*v = 0 // - 9/2
-8*v = -9/2 // : -8
v = -9/2/(-8)
v = 9/16
v = 9/16
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