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n in (-oo:+oo)
5*n+7/5 = n-(1/2) // - n-(1/2)
5*n-n+7/5+1/2 = 0
4*n+19/10 = 0 // - 19/10
4*n = -19/10 // : 4
n = -19/10/4
n = -19/40
n = -19/40
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