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n in (-oo:+oo)
(-2/3)*n-n+1 = 31/36 // - 31/36
(-2/3)*n-n-(31/36)+1 = 0
(-2/3)*n-n-31/36+1 = 0
5/36-5/3*n = 0 // - 5/36
-5/3*n = -5/36 // : -5/3
n = -5/36/(-5/3)
n = 1/12
n = 1/12
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