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n in (-oo:+oo)
2-6*n = 6*n-82 // - 6*n-82
2-6*n-(6*n)+82 = 0
2-6*n-6*n+82 = 0
84-12*n = 0 // - 84
-12*n = -84 // : -12
n = -84/(-12)
n = 7
n = 7
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