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n in (-oo:+oo)
-41 = 3*n-(7*n)-5 // - 3*n-(7*n)-5
7*n-(3*n)-41+5 = 0
7*n-3*n-41+5 = 0
4*n-36 = 0 // + 36
4*n = 36 // : 4
n = 36/4
n = 9
n = 9
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