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s in (-oo:+oo)
420*s = 5/6 // - 5/6
420*s-(5/6) = 0
420*s-5/6 = 0
420*s-5/6 = 0 // + 5/6
420*s = 5/6 // : 420
s = 5/6/420
s = 1/504
s = 1/504
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