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s in (-oo:+oo)
s = ((s-2)^1)/3 // - ((s-2)^1)/3
s-(((s-2)^1)/3) = 0
s-((s-2)/3) = 0
(-1*(s-2))/3+s = 0
(-1*(s-2))/3+(3*s)/3 = 0
3*s-1*(s-2) = 0
2*s+2 = 0
(2*s+2)/3 = 0
(2*s+2)/3 = 0 // * 3
2*s+2 = 0
2*s+2 = 0 // - 2
2*s = -2 // : 2
s = -2/2
s = -1
s = -1
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