literal equations

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Across
  1. 4. b+m/a for z
  2. 5. g=x-c/x for x
  3. 7. u=k/a for a
  4. 9. g=xc for x
  5. 10. g=x-c+y for x
  6. 13. 12am=4 for a
Down
  1. 1. a-c=d-r for a
  2. 2. xm=np for x
  3. 3. u=ak/b for a
  4. 6. g=ca for a
  5. 8. u=x-g for x
  6. 9. g=c+x for x
  7. 11. z=m-x for x
  8. 12. g=6x for x