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S in (-oo:+oo)
(S/1)/2 = 4/5 // - 4/5
(S/1)/2-(4/5) = 0
S/2-4/5 = 0
1/2*S-4/5 = 0 // + 4/5
1/2*S = 4/5 // : 1/2
S = 4/5/1/2
S = 8/5
S = 8/5
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