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s in (-oo:+oo)
(10-s)/3 = s // - s
(10-s)/3-s = 0
(10-s)/3+(3*(-s))/3 = 0
3*(-s)-s+10 = 0
10-4*s = 0
(10-4*s)/3 = 0
(10-4*s)/3 = 0 // * 3
10-4*s = 0
10-4*s = 0 // - 10
-4*s = -10 // : -4
s = -10/(-4)
s = 5/2
s = 5/2
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