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n in (-oo:+oo)
n/54 = 3/18 // - 3/18
n/54-(3/18) = 0
n/54-1/6 = 0
1/54*n-1/6 = 0 // + 1/6
1/54*n = 1/6 // : 1/54
n = 1/6/1/54
n = 9
n = 9
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