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n in (-oo:+oo)
n-(4/5) = 2*n-(13/10) // - 2*n-(13/10)
n-(2*n)-(4/5)+13/10 = 0
n-2*n-4/5+13/10 = 0
1/2-n = 0 // - 1/2
-n = -1/2 // * -1
n = 1/2
n = 1/2
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