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v in (-oo:+oo)
-14.9 = v/8-2.1 // - v/8-2.1
2.1-(v/8)-14.9 = 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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