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n in (-oo:+oo)
n/2 = 31/3 // - 31/3
n/2-(31/3) = 0
n/2-31/3 = 0
1/2*n-31/3 = 0 // + 31/3
1/2*n = 31/3 // : 1/2
n = 31/3/1/2
n = 62/3
n = 62/3
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