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