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n in (-oo:+oo)
3*n = (5*(15/1))/18 // - (5*(15/1))/18
3*n-((5*(15/1))/18) = 0
3*n-25/6 = 0
3*n-25/6 = 0 // + 25/6
3*n = 25/6 // : 3
n = 25/6/3
n = 25/18
n = 25/18
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