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n in (-oo:+oo)
-13 = 7*n-5*n+1 // - 7*n-5*n+1
-(-5*n)-(7*n)-13-1 = 0
5*n-7*n-13-1 = 0
-2*n-14 = 0 // + 14
-2*n = 14 // : -2
n = 14/(-2)
n = -7
n = -7
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