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S in (-oo:+oo)
S/9 = 4/13 // - 4/13
S/9-(4/13) = 0
S/9-4/13 = 0
1/9*S-4/13 = 0 // + 4/13
1/9*S = 4/13 // : 1/9
S = 4/13/1/9
S = 36/13
S = 36/13
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