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n in (-oo:+oo)
(1/2)*n+(5/4)*n+5/8+1 = 0
7/4*n+13/8 = 0 // - 13/8
7/4*n = -13/8 // : 7/4
n = -13/8/7/4
n = -13/14
n = -13/14
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