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n in (-oo:+oo)
31/18 = (-1/3)*n-(3*n)-(1/2) // - (-1/3)*n-(3*n)-(1/2)
3*n-((-1/3)*n)+31/18+1/2 = 0
(1/3)*n+3*n+31/18+1/2 = 0
10/3*n+20/9 = 0 // - 20/9
10/3*n = -20/9 // : 10/3
n = -20/9/10/3
n = -2/3
n = -2/3
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