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