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n in (-oo:+oo)
-5*n-4 = 3*n-28 // - 3*n-28
28-5*n-(3*n)-4 = 0
28-5*n-3*n-4 = 0
24-8*n = 0 // - 24
-8*n = -24 // : -8
n = -24/(-8)
n = 3
n = 3
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