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n in (-oo:+oo)
1 = 6*n-5*n-7 // - 6*n-5*n-7
1-(-5*n)-(6*n)+7 = 0
5*n-6*n+1+7 = 0
8-n = 0 // - 8
-n = -8 // * -1
n = 8
n = 8
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