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s in (-oo:+oo)
(10-(5*s))/3 = 6-s // - 6-s
(10-(5*s))/3+s-6 = 0
(10-5*s)/3+s-6 = 0
(10-5*s)/3+(3*s)/3+(-6*3)/3 = 0
3*s-5*s-6*3+10 = 0
10-2*s-18 = 0
-2*s-8 = 0
(-2*s-8)/3 = 0
(-2*s-8)/3 = 0 // * 3
-2*s-8 = 0
-2*s-8 = 0 // + 8
-2*s = 8 // : -2
s = 8/(-2)
s = -4
s = -4
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