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n in (-oo:+oo)
7*(9-(6*n)) = -357 // + 357
7*(9-(6*n))+357 = 0
7*(9-6*n)+357 = 0
7*(9-6*n)+357 = 0
420-42*n = 0
420-42*n = 0
420-42*n = 0 // - 420
-42*n = -420 // : -42
n = -420/(-42)
n = 10
n = 10
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