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n in (-oo:+oo)
(7*n)/9-62 = (5*n)/9-49 // - (5*n)/9-49
(7*n)/9-((5*n)/9)-62+49 = 0
(7*n)/9+(-5/9)*n-62+49 = 0
2/9*n-13 = 0 // + 13
2/9*n = 13 // : 2/9
n = 13/2/9
n = 117/2
n = 117/2
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