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n in (-oo:+oo)
n/2 = 3*4 // - 3*4
n/2-(3*4) = 0
n/2-12 = 0
1/2*n-12 = 0 // + 12
1/2*n = 12 // : 1/2
n = 12/1/2
n = 24
n = 24
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