Algebra

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123456
Across
  1. 2. a+2b+2a+3b
  2. 4. b+b
  3. 5. 2a+b-a+2b+c
  4. 6. a+a+a+a
Down
  1. 1. 5b+3c+2b-c
  2. 3. Multiply a with c
  3. 5. Subtract 4 from a