Question

add:3ab, -5ab, 2ab, -7ab

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Answer 1

3ab+(-5ab) +2ab+(-7ab)

= -7ab

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Answer 2

$3 ab+(- 5ab) + 2ab+( - 7ab) \\3ab-5ab+2ab-7ab\\ 5 ab- 12ab \\ = - 7ab \:$

Here is your answer mate .

I hope that helps you.