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n in (-oo:+oo)
n/2 = 18/6 // - 18/6
n/2-(18/6) = 0
n/2-3 = 0
1/2*n-3 = 0 // + 3
1/2*n = 3 // : 1/2
n = 3/1/2
n = 6
n = 6
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