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n in (-oo:+oo)
-16 = 2*n-n-6 // - 2*n-n-6
n-(2*n)-16+6 = 0
n-2*n-16+6 = 0
-n-10 = 0 // + 10
-n = 10 // * -1
n = -10
n = -10
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