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n in (-oo:+oo)
9*n-(n/2) = 27-7 // - 27-7
9*n-(n/2)-27+7 = 0
17/2*n-20 = 0 // + 20
17/2*n = 20 // : 17/2
n = 20/17/2
n = 40/17
n = 40/17
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