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n in (-oo:+oo)
n/18 = 4/9 // - 4/9
n/18-(4/9) = 0
n/18-4/9 = 0
1/18*n-4/9 = 0 // + 4/9
1/18*n = 4/9 // : 1/18
n = 4/9/1/18
n = 8
n = 8
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