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n in (-oo:+oo)
-n-(1/2) = 10 // - 10
-n-(1/2)-10 = 0
-n-1/2-10 = 0
-n-21/2 = 0 // + 21/2
-n = 21/2 // * -1
n = -21/2
n = -21/2
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