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n in (-oo:+oo)
3*n+21/3 = (4/5)*n+18 // - (4/5)*n+18
3*n-((4/5)*n)+21/3-18 = 0
3*n+(-4/5)*n+21/3-18 = 0
11/5*n-11 = 0 // + 11
11/5*n = 11 // : 11/5
n = 11/11/5
n = 5
n = 5
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