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Plz help me with 3 of those questions

Plz help me with 3 of those questions-example-1

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7. She is not correct. The simplification of this expression is 22a-32.

8. She is correct. The simplification of this expression is 4a-10.

The last one is tricky because I honestly do not know how to do it but you can google It.

I hope that it helped some though

User Cannatag
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