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n in (-oo:+oo)
1/2-n = 1/6 // - 1/6
1/2-n-(1/6) = 0
1/2-n-1/6 = 0
1/3-n = 0 // - 1/3
-n = -1/3 // * -1
n = 1/3
n = 1/3
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