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n in (-oo:+oo)
(5/8)*n = 15/4 // - 15/4
(5/8)*n-(15/4) = 0
(5/8)*n-15/4 = 0
5/8*n-15/4 = 0 // + 15/4
5/8*n = 15/4 // : 5/8
n = 15/4/5/8
n = 6
n = 6
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