Where am I making the mistake in below question?

Simplify 4.523/6+1/4^2 divided by 0.75

45/10- 1+1/16 divided by 3/4
9/2 - 17/16 dividend by 3/4
72-17/16 divided by 3/4
55/16 *4/3

But in the GMAT club test answer it comes 57/16 * 4/3

In that subtraction is done before addition. But I did addition before subtraction.
Can anyone please clarify PEMDAS rule for me? I understand multiplication and division comes before + and - but does not understand rule between + and - with out parenthes, * and division with out parenthes.

Thanks in advance..