By subtracting the sum of 2mn+6m²-n² and m²-3mn+4n² from mn-m²+4 we get ?
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sum of 2mn+6m2-n2 and -3mn+m2+4n2
=2mn+6m2-n2-3mn+m2+4n2
= -mn+7m2+3n2
subtract mn-m2+4+mn-7m2+3n2 =2mn-8m2+3n2+4
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