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n in (-oo:+oo)
6*n-3*n+1/2 = 67/2 // - 67/2
6*n-3*n+1/2-(67/2) = 0
6*n-3*n+1/2-67/2 = 0
3*n-33 = 0 // + 33
3*n = 33 // : 3
n = 33/3
n = 11
n = 11
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