m^2-9n^2-m+3n
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m^2-9n^2-m+3nm^2-9n^2-m+3nm^2-9n^2-m+3nm^2-9n^2-m+3n=(m+3n)(m-3n)-(m-3n)=(m-3n)(m+3n-1)
m^2-9n^2-m+3n
m^2-9n^2-m+3n
m^2-9n^2-m+3n
m^2-9n^2-m+3n
=(m+3n)(m-3n)-(m-3n)
=(m-3n)(m+3n-1)
(3m-2n)^+(3m+2n) (3m-2n)-9(m+n)^
4m^2(m+n)-9n^2(m+n)
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(3m-n)(m-2n)=()
(m+2n)(m-3n)