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Book b is twice as long as book a. book c is 30 pages longer then book b. together the three books have 280 pages

I just need help with question number 10
It has to be solved algebraically

Can someone please help me with this problems ​

Book b is twice as long as book a. book c is 30 pages longer then book b. together the three books have 280 pagesI just need help with question number 10It has class=

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