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n in (-oo:+oo)
2*n-(3/5) = n-(1/4) // - n-(1/4)
2*n-n-(3/5)+1/4 = 0
2*n-n-3/5+1/4 = 0
n-7/20 = 0 // + 7/20
n = 7/20
n = 7/20
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