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n in (-oo:+oo)
10-5*n-(3*n) = -46 // + 46
10-5*n-(3*n)+46 = 0
10-5*n-3*n+46 = 0
56-8*n = 0 // - 56
-8*n = -56 // : -8
n = -56/(-8)
n = 7
n = 7
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