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v in (-oo:+oo)
-15.9 = v/8-3.1 // - v/8-3.1
3.1-(v/8)-15.9 = 0
-1/8*v-12.8 = 0 // + 12.8
-1/8*v = 12.8 // : -1/8
v = 12.8/(-1/8)
v = -102.4
v = -102.4
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