2 * 4 + 3 - 8 / 2 = 2 * 4 + 3 - 8 / 2 -----
* and / have the same priority, so do the leftmost of them first. The + and the - share a lower priority so they will not be done until later.
After the first operation ( * ) is done, the result is:
2 * 4 + 3 - 8 / 2 = 8 + 3 - 8 / 2 -----
What operator is done next?
8 + 3 - 8 / 2