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s in (-oo:+oo)
-s-(8/5) = -21/10 // + -21/10
-s-(8/5)-(-21/10) = 0
21/10-s-8/5 = 0
1/2-s = 0 // - 1/2
-s = -1/2 // * -1
s = 1/2
s = 1/2
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