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v in (-oo:+oo)
v/4 = 12.8 // - 12.8
v/4-12.8 = 0
1/4*v-12.8 = 0 // + 12.8
1/4*v = 12.8 // : 1/4
v = 12.8/1/4
v = 51.2
v = 51.2
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