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n in (-oo:+oo)
2*n = 39/5 // - 39/5
2*n-(39/5) = 0
2*n-39/5 = 0
2*n-39/5 = 0 // + 39/5
2*n = 39/5 // : 2
n = 39/5/2
n = 39/10
n = 39/10
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