Revision-
1) Subtract 6a²-7a+b from 9a²+10 a b+3b²
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= 9a²+10ab+3b² -( 6a²-7a+b)
= 9a²+10ab +3b² - 6a²+7a-b
= 3a²+3b²+10ab +7a+b
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