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n in (-oo:+oo)
-(7*n)-(3*n)-1 = 79 // - 79
-(7*n)-(3*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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