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n in (-oo:+oo)
(1/3)*n-(8/9) = -13/12 // + -13/12
(1/3)*n-(8/9)-(-13/12) = 0
(1/3)*n-8/9+13/12 = 0
1/3*n+7/36 = 0 // - 7/36
1/3*n = -7/36 // : 1/3
n = -7/36/1/3
n = -7/12
n = -7/12
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