(8/72+13/72)-12/72-(16/72-7/72)

Question

(8/72+13/72)-12/72-(16/72-7/72)

Answer 1

21/72-12/72-9/72=9/72-9/72=0

Answer 2

(8/72+13/72)-12/72-(16/72-7/72)=21/72-12/72-9/72=9/72-9/72=0