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n in (-oo:+oo)
31/30 = (-2/5)*n-((1/3)*n)+2/3 // - (-2/5)*n-((1/3)*n)+2/3
(1/3)*n-((-2/5)*n)+31/30-(2/3) = 0
(2/5)*n+(1/3)*n+31/30-2/3 = 0
11/15*n+11/30 = 0 // - 11/30
11/15*n = -11/30 // : 11/15
n = -11/30/11/15
n = -1/2
n = -1/2
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