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