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n in (-oo:+oo)
-(4*n)-5 = 16-7*n // - 16-7*n
-(4*n)-(-7*n)-16-5 = 0
7*n-4*n-16-5 = 0
3*n-21 = 0 // + 21
3*n = 21 // : 3
n = 21/3
n = 7
n = 7
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