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n in (-oo:+oo)
3*n+(2/3)*n-7 = -131/3 // + -131/3
3*n+(2/3)*n-(-131/3)-7 = 0
3*n+(2/3)*n+131/3-7 = 0
11/3*n+110/3 = 0 // - 110/3
11/3*n = -110/3 // : 11/3
n = -110/3/11/3
n = -10
n = -10
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