Can anyone say why 8-12+9=5?

I thought it would be -13 but my teacher said its wrong. How is it 5 if In BODMAS addition comes first? Shouldnt it be 12+9= 21 and then 8-21= -13???

I thought it would be -13 but my teacher said it's wrong. How is it 5 if In BODMAS addition comes first? Shouldn't it be 12+9= 21 and then 8-21= -13???

or:I thought it would be -13 but my teacher said it's wrong. How is it 5 if In BODMAS addition comes first? Shouldn't it be 12+9= 21 and then 8-21= -13???

Tags:thought,