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