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n in (-oo:+oo)
(5/8)*n+3 = -6 // + 6
(5/8)*n+3+6 = 0
5/8*n+9 = 0 // - 9
5/8*n = -9 // : 5/8
n = -9/5/8
n = -72/5
n = -72/5
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