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n in (-oo:+oo)
n/2 = 13/4 // - 13/4
n/2-(13/4) = 0
n/2-13/4 = 0
1/2*n-13/4 = 0 // + 13/4
1/2*n = 13/4 // : 1/2
n = 13/4/1/2
n = 13/2
n = 13/2
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