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s in (-oo:+oo)
s/13-s = 2 // - 2
s/13-s-2 = 0
-12/13*s-2 = 0 // + 2
-12/13*s = 2 // : -12/13
s = 2/(-12/13)
s = -13/6
s = -13/6
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