Subtract : (a)16 m² -102 mn + m²n² from - m²n²- 34mn +56m².
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( - m²n²- 34mn +56m²)-(16 m² -102 mn + m²n²)
-m²n²- 34mn +56m²-16 m²+102 mn+ m²n²
-34mn+102mn+40m²
68mn+40m²
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