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