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v in (-oo:+oo)
v/20 = 8/4 // - 8/4
v/20-(8/4) = 0
v/20-2 = 0
1/20*v-2 = 0 // + 2
1/20*v = 2 // : 1/20
v = 2/1/20
v = 40
v = 40
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