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n in (-oo:+oo)
-2*n-6 = 2*n+26 // - 2*n+26
-2*n-(2*n)-26-6 = 0
-2*n-2*n-26-6 = 0
-4*n-32 = 0 // + 32
-4*n = 32 // : -4
n = 32/(-4)
n = -8
n = -8
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