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n in (-oo:+oo)
-2*n = 10/9 // - 10/9
-2*n-(10/9) = 0
-2*n-10/9 = 0
-2*n-10/9 = 0 // + 10/9
-2*n = 10/9 // : -2
n = 10/9/(-2)
n = -5/9
n = -5/9
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