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n in (-oo:+oo)
(1/2)*(8*n+3) = 25.5 // - 25.5
(1/2)*(8*n+3)-25.5 = 0
1/2*(8*n+3)-25.5 = 0
1/2*(8*n+3)-25.5 = 0
4*n-24 = 0
4*n-24 = 0
4*n-24 = 0 // + 24
4*n = 24 // : 4
n = 24/4
n = 6
n = 6
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