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n in (-oo:+oo)
8-3*n = 3*n+7 // - 3*n+7
8-3*n-(3*n)-7 = 0
8-3*n-3*n-7 = 0
1-6*n = 0 // - 1
-6*n = -1 // : -6
n = -1/(-6)
n = 1/6
n = 1/6
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