How much is 5a2-2ab+c2 less than 2a2+7ab+2c2?
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3ab−2a
2
−2b
2
−(5a
2
−7ab+5b
2
)
3ab−2a
2
−2b
2
−5a
2
+7ab−5b
2
10ab−7a
2
−7b
2
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