What should be subtracted from -7mn +2m + 3n to getm+ 2mn+n
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9mn-m-4n should be subtracted from -7mn+2m+3n to get m+2mn+n.
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-7mn+2m+3n-(x)=m+2mn+n
9mn-m-2n should be subtracted from -7mn+2m+3n to get m+2mn+n
9mn-m-2n should be subtracted from -7mn+2m+3n to get m+2mn+n
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