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n in (-oo:+oo)
6*n+3 = 3*n+27 // - 3*n+27
6*n-(3*n)-27+3 = 0
6*n-3*n-27+3 = 0
3*n-24 = 0 // + 24
3*n = 24 // : 3
n = 24/3
n = 8
n = 8
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