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