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n in (-oo:+oo)
(7*n)/9 = 12*n-(6/15) // - 12*n-(6/15)
(7*n)/9-(12*n)+6/15 = 0
(7*n)/9-12*n+6/15 = 0
2/5-101/9*n = 0 // - 2/5
-101/9*n = -2/5 // : -101/9
n = -2/5/(-101/9)
n = 18/505
n = 18/505
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