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n in (-oo:+oo)
n/3 = 12/9 // - 12/9
n/3-(12/9) = 0
n/3-4/3 = 0
1/3*n-4/3 = 0 // + 4/3
1/3*n = 4/3 // : 1/3
n = 4/3/1/3
n = 4
n = 4
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