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n in (-oo:+oo)
(2/3)*n-9 = 8/9 // - 8/9
(2/3)*n-(8/9)-9 = 0
(2/3)*n-8/9-9 = 0
2/3*n-89/9 = 0 // + 89/9
2/3*n = 89/9 // : 2/3
n = 89/9/2/3
n = 89/6
n = 89/6
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