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n in (-oo:+oo)
n-6 = 4*n+27 // - 4*n+27
n-(4*n)-27-6 = 0
n-4*n-27-6 = 0
-3*n-33 = 0 // + 33
-3*n = 33 // : -3
n = 33/(-3)
n = -11
n = -11
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