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n in (-oo:+oo)
n/3-((7*n)/12) = 2/3 // - 2/3
n/3-((7*n)/12)-(2/3) = 0
n/3+(-7/12)*n-2/3 = 0
-1/4*n-2/3 = 0 // + 2/3
-1/4*n = 2/3 // : -1/4
n = 2/3/(-1/4)
n = -8/3
n = -8/3
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