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I need a algebric sum like sub 4a-7ab+3b+12 from 12a-9ab+5b-3

and add like ab-bc,bc-ca,ca-ab
i need five add and sub questions for class


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1. Subtract a²+ab-2b² from 5b²+a²-3b
2. Subtract a²+7a-15ab-2b from 15a²+2ab+b²-7a+12ab
3. add (a-b)² and (a+b)²
4. add a-bc, b-ca, c-ab.
5 add a²+7a-15ab-2b, 5b²+a²-3b and a²+ab-2b².
2 4 2
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