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n in (-oo:+oo)
6*n+7 = 3*n-17 // - 3*n-17
6*n-(3*n)+7+17 = 0
6*n-3*n+7+17 = 0
3*n+24 = 0 // - 24
3*n = -24 // : 3
n = -24/3
n = -8
n = -8
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