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n in (-oo:+oo)
25 = 4*n+4*n+9 // - 4*n+4*n+9
25-(4*n)-(4*n)-9 = 0
25-4*n-4*n-9 = 0
16-8*n = 0 // - 16
-8*n = -16 // : -8
n = -16/(-8)
n = 2
n = 2
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