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