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n in (-oo:+oo)
24 = 6*n-n+4 // - 6*n-n+4
n-(6*n)-4+24 = 0
n-6*n-4+24 = 0
20-5*n = 0 // - 20
-5*n = -20 // : -5
n = -20/(-5)
n = 4
n = 4
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