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n in (-oo:+oo)
3*n+3/5 = 2*n+18/5 // - 2*n+18/5
3*n-(2*n)+3/5-(18/5) = 0
3*n-2*n+3/5-18/5 = 0
n-3 = 0 // + 3
n = 3
n = 3
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