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n in (-oo:+oo)
(2/5)*n+(3/5)*n+2 = 9/4 // - 9/4
(2/5)*n+(3/5)*n-(9/4)+2 = 0
(2/5)*n+(3/5)*n-9/4+2 = 0
n-1/4 = 0 // + 1/4
n = 1/4
n = 1/4
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