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n in (-oo:+oo)
n/9 = 35/45 // - 35/45
n/9-(35/45) = 0
n/9-7/9 = 0
1/9*n-7/9 = 0 // + 7/9
1/9*n = 7/9 // : 1/9
n = 7/9/1/9
n = 7
n = 7
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