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n in (-oo:+oo)
-1 = 4*n-5*n+6 // - 4*n-5*n+6
-(-5*n)-(4*n)-6-1 = 0
5*n-4*n-6-1 = 0
n-7 = 0 // + 7
n = 7
n = 7
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