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n in (-oo:+oo)
6*n-(3*n)+1 = -8 // + 8
6*n-(3*n)+1+8 = 0
6*n-3*n+1+8 = 0
3*n+9 = 0 // - 9
3*n = -9 // : 3
n = -9/3
n = -3
n = -3
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