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n in (-oo:+oo)
(5/2)*n = 15/4 // - 15/4
(5/2)*n-(15/4) = 0
(5/2)*n-15/4 = 0
5/2*n-15/4 = 0 // + 15/4
5/2*n = 15/4 // : 5/2
n = 15/4/5/2
n = 3/2
n = 3/2
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