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n in (-oo:+oo)
-20/3 = 2*n+2*n // - 2*n+2*n
-(2*n)-(2*n)-20/3 = 0
-2*n-2*n-20/3 = 0
-4*n-20/3 = 0 // + 20/3
-4*n = 20/3 // : -4
n = 20/3/(-4)
n = -5/3
n = -5/3
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