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m2-mn-2n2-m+5n-2 =(m-2n)(m+n)+[-(2m-4n)+(m+n]-2 =(m-2n)(m+n)-2(m-2n)+(m+n-2) =(m-2n)(m+n-2)+(m+n-2) =(m+n-2)(m-2n+1)
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