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v in (-oo:+oo)
v/10 = 2/4 // - 2/4
v/10-(2/4) = 0
v/10-1/2 = 0
1/10*v-1/2 = 0 // + 1/2
1/10*v = 1/2 // : 1/10
v = 1/2/1/10
v = 5
v = 5
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