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n in (-oo:+oo)
5*n+7 = 6*n+14 // - 6*n+14
5*n-(6*n)-14+7 = 0
5*n-6*n-14+7 = 0
-n-7 = 0 // + 7
-n = 7 // * -1
n = -7
n = -7
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