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n in (-oo:+oo)
2/3-((5/6)*n) = 31/54 // - 31/54
2/3-((5/6)*n)-(31/54) = 0
(-5/6)*n+2/3-31/54 = 0
5/54-5/6*n = 0 // - 5/54
-5/6*n = -5/54 // : -5/6
n = -5/54/(-5/6)
n = 1/9
n = 1/9
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