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s in (-oo:+oo)
15/35 = s/7 // - s/7
15/35-(s/7) = 0
3/7-1/7*s = 0 // - 3/7
-1/7*s = -3/7 // : -1/7
s = -3/7/(-1/7)
s = 3
s = 3
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