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n in (-oo:+oo)
3*n-(1/6)+1/3 = 0
3*n-1/6+1/3 = 0
3*n+1/6 = 0 // - 1/6
3*n = -1/6 // : 3
n = -1/6/3
n = -1/18
n = -1/18
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