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n in (-oo:+oo)
-42/3 = (2*n)/3+n/3 // - (2*n)/3+n/3
-((2*n)/3)-(n/3)-42/3 = 0
(-2/3)*n-(n/3)-42/3 = 0
-n-14 = 0 // + 14
-n = 14 // * -1
n = -14
n = -14
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