take away 2a+3b-4ab from 7a-3b+4ab
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7a-3b+4ab-[2a+3b-4ab]
opening brackets changes sign
7a-3b+4ab-2a-3b+4ab
then ,club like terms
7a-2a-3b-3b+4ab+4ab
5a-(-6b)+8ab
=5a+6b+8ab
mark brainliest
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