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n in (-oo:+oo)
3*n = 2/5-(5/8) // - 2/5-(5/8)
3*n-(2/5)+5/8 = 0
3*n-2/5+5/8 = 0
3*n+9/40 = 0 // - 9/40
3*n = -9/40 // : 3
n = -9/40/3
n = -3/40
n = -3/40
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