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Ahuva · Answer 1 · 2019-02-17T10:05:08+0000

Given:
(-3ab+7a-2) - (-9ab-4)
Expand the expression using plus/minus rule.
-(-a)=a and -(a)=-a
=-3ab+7a-2 + 9ab +4
Add like terms
=6ab+7a+2

Answer: 6ab + 7a + 2

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