33-5*3/5+9
5*8+48/4
40/4+8*7
$$\int_{\Box}^{\Box}(\Box) d\Box$$ x/((x^2)+1)
7*5+21/3-5
5*2+10/5
55 divided by 4
4n+546-576
6*6/2+5
5x-9