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n in (-oo:+oo)
(5/8)*n-7 = -8 // + 8
(5/8)*n-7+8 = 0
5/8*n+1 = 0 // - 1
5/8*n = -1 // : 5/8
n = -1/5/8
n = -8/5
n = -8/5
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