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v in (-oo:+oo)
v/6.4 = 4 // - 4
v/6.4-4 = 0
0.15625*v-4 = 0 // + 4
0.15625*v = 4 // : 0.15625
v = 4/0.15625
v = 25.6
v = 25.6
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