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n in (-oo:+oo)
42/3 = (2*n)/3+n/3+1/3 // - (2*n)/3+n/3+1/3
42/3-((2*n)/3)-(n/3)-(1/3) = 0
(-2/3)*n-(n/3)+42/3-1/3 = 0
41/3-n = 0 // - 41/3
-n = -41/3 // * -1
n = 41/3
n = 41/3
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