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n in (-oo:+oo)
(2/3)*n+2/9 = 11/18 // - 11/18
(2/3)*n+2/9-(11/18) = 0
(2/3)*n+2/9-11/18 = 0
2/3*n-7/18 = 0 // + 7/18
2/3*n = 7/18 // : 2/3
n = 7/18/2/3
n = 7/12
n = 7/12
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