Across
- 4. 13ab+13bcd-5ab-4bcd-3bcd
- 5. 5a+3a-7b+c-4d+2c
- 7. 3a+3b+3c-2a-2b-c
- 9. 13a+55ab-5abc+2abc-13ab
Down
- 1. 3chairs+1desks+2chairs+1desks
- 2. 5pens+9pencils-2pens-3pencils
- 3. 2abcd+3abcd+2abcd
- 5. 5(99999999+79484634)
- 6. 3a+3ab+3b+5ab+b
- 8. 2(3ab-6ac+10bc+2ac-2bc)