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n in (-oo:+oo)
6*n-2*n-(1/2) = 39/2 // - 39/2
6*n-2*n-(1/2)-(39/2) = 0
6*n-2*n-1/2-39/2 = 0
4*n-20 = 0 // + 20
4*n = 20 // : 4
n = 20/4
n = 5
n = 5
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