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n in (-oo:+oo)
(1/3)*(5*n+12)+(1/3)*n = -1 // + 1
(1/3)*(5*n+12)+(1/3)*n+1 = 0
1/3*(5*n+12)+n/3+1 = 0
(1/3*3*(5*n+12))/3+n/3+(1*3)/3 = 0
1/3*3*(5*n+12)+n+1*3 = 0
6*n+3+12 = 0
6*n+15 = 0
(6*n+15)/3 = 0
(6*n+15)/3 = 0 // * 3
6*n+15 = 0
6*n+15 = 0 // - 15
6*n = -15 // : 6
n = -15/6
n = -5/2
n = -5/2
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