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v in (-oo:+oo)
v/4 = 5.12 // - 5.12
v/4-5.12 = 0
1/4*v-5.12 = 0 // + 5.12
1/4*v = 5.12 // : 1/4
v = 5.12/1/4
v = 20.48
v = 20.48
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