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n in (-oo:+oo)
2/3-(n/12) = 1/4 // - 1/4
2/3-(n/12)-(1/4) = 0
2/3-(n/12)-1/4 = 0
5/12-1/12*n = 0 // - 5/12
-1/12*n = -5/12 // : -1/12
n = -5/12/(-1/12)
n = 5
n = 5
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