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n in (-oo:+oo)
7*n-(4*n)-5 = 19 // - 19
7*n-(4*n)-19-5 = 0
7*n-4*n-19-5 = 0
3*n-24 = 0 // + 24
3*n = 24 // : 3
n = 24/3
n = 8
n = 8
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