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s in (-oo:+oo)
3.5/13 = s/51 // - s/51
3.5/13-(s/51) = 0
0.26923077-1/51*s = 0 // - 0.26923077
-1/51*s = -0.26923077 // : -1/51
s = -0.26923077/(-1/51)
s = 13.73077147
s = 13.73077147
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