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n in (-oo:+oo)
3*n+5/3 = (4/5)*n+18 // - (4/5)*n+18
3*n-((4/5)*n)+5/3-18 = 0
3*n+(-4/5)*n+5/3-18 = 0
11/5*n-49/3 = 0 // + 49/3
11/5*n = 49/3 // : 11/5
n = 49/3/11/5
n = 245/33
n = 245/33
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