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n in (-oo:+oo)
(1/4)*n+(1/2)*n-(3/5)+2 = 11/4 // - 11/4
(1/4)*n+(1/2)*n-(3/5)-(11/4)+2 = 0
(1/4)*n+(1/2)*n-3/5-11/4+2 = 0
3/4*n-27/20 = 0 // + 27/20
3/4*n = 27/20 // : 3/4
n = 27/20/3/4
n = 9/5
n = 9/5
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