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n in (-oo:+oo)
3*n-(n/2) = 36 // - 36
3*n-(n/2)-36 = 0
5/2*n-36 = 0 // + 36
5/2*n = 36 // : 5/2
n = 36/5/2
n = 72/5
n = 72/5
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