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n in (-oo:+oo)
-5*n-6 = 2*n-27 // - 2*n-27
27-5*n-(2*n)-6 = 0
27-5*n-2*n-6 = 0
21-7*n = 0 // - 21
-7*n = -21 // : -7
n = -21/(-7)
n = 3
n = 3
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