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n in (-oo:+oo)
n/5 = 9/15 // - 9/15
n/5-(9/15) = 0
n/5-3/5 = 0
1/5*n-3/5 = 0 // + 3/5
1/5*n = 3/5 // : 1/5
n = 3/5/1/5
n = 3
n = 3
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