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n in (-oo:+oo)
-42/3 = (2*n)/3+(2*n)/3+1/3 // - (2*n)/3+(2*n)/3+1/3
-((2*n)/3)-((2*n)/3)-42/3-(1/3) = 0
(-2/3)*n+(-2/3)*n-42/3-1/3 = 0
-4/3*n-43/3 = 0 // + 43/3
-4/3*n = 43/3 // : -4/3
n = 43/3/(-4/3)
n = -43/4
n = -43/4
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