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s in (-oo:+oo)
4/21 = s/84 // - s/84
4/21-(s/84) = 0
4/21-1/84*s = 0 // - 4/21
-1/84*s = -4/21 // : -1/84
s = -4/21/(-1/84)
s = 16
s = 16
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