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n in (-oo:+oo)
(7*n)/9-69 = (5*n)/9-48 // - (5*n)/9-48
(7*n)/9-((5*n)/9)-69+48 = 0
(7*n)/9+(-5/9)*n-69+48 = 0
2/9*n-21 = 0 // + 21
2/9*n = 21 // : 2/9
n = 21/2/9
n = 189/2
n = 189/2
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