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S in (-oo:+oo)
S/3 = 2.8 // - 2.8
S/3-2.8 = 0
1/3*S-2.8 = 0 // + 2.8
1/3*S = 2.8 // : 1/3
S = 2.8/1/3
S = 8.40000008
S = 8.40000008
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