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n in (-oo:+oo)
6*n-(2*n)+1 = -27 // + 27
6*n-(2*n)+1+27 = 0
6*n-2*n+1+27 = 0
4*n+28 = 0 // - 28
4*n = -28 // : 4
n = -28/4
n = -7
n = -7
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