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2m-3n-[-2m+n-m+n]
2m-3n-[-3m+2n]
2m-3n+3m-2n
5m-5n
2m-3n-[-2m+n-m+n]
2m-3n+2m-n+m-n
se agrupan los m y n
5m-5n
factorizas
5(m-n)