Subtract : 7xy + 5x² - 7y² + 3 from 7x² - 8xy + 3y² - 5
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7xy+5x
2
−7y
2
+3 from 7x
2
−8xy+3y
2
−5
=(7x
2
+3y
2
−8xy−5)−(7xy+5x
2
−7y
2
+3)
=7x
2
+3y
2
−8xy−5−7xy−5x
2
−7y
2
−5−3
=2x
2
+10y
2
−15xy−8
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