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n in (-oo:+oo)
(1/2)*n-9 = -205/24 // + -205/24
(1/2)*n-(-205/24)-9 = 0
(1/2)*n+205/24-9 = 0
1/2*n-11/24 = 0 // + 11/24
1/2*n = 11/24 // : 1/2
n = 11/24/1/2
n = 11/12
n = 11/12
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