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n in (-oo:+oo)
n/72 = 2/18 // - 2/18
n/72-(2/18) = 0
n/72-1/9 = 0
1/72*n-1/9 = 0 // + 1/9
1/72*n = 1/9 // : 1/72
n = 1/9/1/72
n = 8
n = 8
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