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n in (-oo:+oo)
(1/2)*n+6 = 25/4 // - 25/4
(1/2)*n-(25/4)+6 = 0
(1/2)*n-25/4+6 = 0
1/2*n-1/4 = 0 // + 1/4
1/2*n = 1/4 // : 1/2
n = 1/4/1/2
n = 1/2
n = 1/2
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