In my 8th grade math calss today, our teacher gave us this problem:

5+4/8*9-8+6+5-8+6/24+21/12-5+5+3. According to our TI-30's, which follow PEMDAS, gave us. According to PEMDAS, you should solve the equation accordin go its rules. But thats not right ,because division and mutliplication do not out rank each other. So should PEMDAS be:

P

E

M/D

A/S

because addition and subtraction dont out rank each other either. That would also mean to solve the equation left to right, because bothe pairs of operations are being used, which means even though our TI-30's follow PEMDAS, they are wrong. Can anyone help me?!?