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n in (-oo:+oo)
(1/2)*(8*n-2) = 7-(2*n) // - 7-(2*n)
(1/2)*(8*n-2)+2*n-7 = 0
1/2*(8*n-2)+2*n-7 = 0
1/2*(8*n-2)+2*n-7 = 0
6*n-7-1 = 0
6*n-8 = 0
6*n-8 = 0
6*n-8 = 0 // + 8
6*n = 8 // : 6
n = 8/6
n = 4/3
n = 4/3
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