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v in (-oo:+oo)
v/12.8 = 8 // - 8
v/12.8-8 = 0
0.078125*v-8 = 0 // + 8
0.078125*v = 8 // : 0.078125
v = 8/0.078125
v = 102.4
v = 102.4
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