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n in (-oo:+oo)
(6*n)/5 = 5*n-57 // - 5*n-57
(6*n)/5-(5*n)+57 = 0
(6*n)/5-5*n+57 = 0
57-19/5*n = 0 // - 57
-19/5*n = -57 // : -19/5
n = -57/(-19/5)
n = 15
n = 15
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