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n in (-oo:+oo)
(2/3)*n = 7/9 // - 7/9
(2/3)*n-(7/9) = 0
(2/3)*n-7/9 = 0
2/3*n-7/9 = 0 // + 7/9
2/3*n = 7/9 // : 2/3
n = 7/9/2/3
n = 7/6
n = 7/6
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