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n in (-oo:+oo)
-42/3 = (2*n)/3+n/3+1/3 // - (2*n)/3+n/3+1/3
-((2*n)/3)-(n/3)-42/3-(1/3) = 0
(-2/3)*n-(n/3)-42/3-1/3 = 0
-n-43/3 = 0 // + 43/3
-n = 43/3 // * -1
n = -43/3
n = -43/3
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