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n in (-oo:+oo)
2*n = 80/3 // - 80/3
2*n-(80/3) = 0
2*n-80/3 = 0
2*n-80/3 = 0 // + 80/3
2*n = 80/3 // : 2
n = 80/3/2
n = 40/3
n = 40/3
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