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s in (-oo:+oo)
s = (3.13*1021^1)/2 // - (3.13*1021^1)/2
s-((3.13*1021^1)/2) = 0
s-1597.865 = 0
s-1597.865 = 0 // + 1597.865
s = 1597.865
s = 1597.865
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