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n in (-oo:+oo)
3*n+(2/1)/3 = 4/5+18 // - 4/5+18
3*n+(2/1)/3-(4/5)-18 = 0
3*n+2/3-4/5-18 = 0
3*n-272/15 = 0 // + 272/15
3*n = 272/15 // : 3
n = 272/15/3
n = 272/45
n = 272/45
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