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n in (-oo:+oo)
-5 = 7*n-6*n+2 // - 7*n-6*n+2
-(-6*n)-(7*n)-5-2 = 0
6*n-7*n-5-2 = 0
-n-7 = 0 // + 7
-n = 7 // * -1
n = -7
n = -7
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