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s in (-oo:+oo)
40/98 = s/112 // - s/112
40/98-(s/112) = 0
20/49-1/112*s = 0 // - 20/49
-1/112*s = -20/49 // : -1/112
s = -20/49/(-1/112)
s = 320/7
s = 320/7
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