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n in (-oo:+oo)
-79 = 1-7*n-(3*n) // - 1-7*n-(3*n)
3*n-(-7*n)-79-1 = 0
7*n+3*n-79-1 = 0
10*n-80 = 0 // + 80
10*n = 80 // : 10
n = 80/10
n = 8
n = 8
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