So, this is the formula I have at hand:

`left lbrace { binom { B _ { x , d } { ~ = ~ } b ( - 5 ) ^ { 2 over 3 } ~~~~ A _ { x , n } { ~ = ~ } b } { { } } } right none`

I would like the formulas to align to the left. However, I do not need the numbers in the numerator and the denominator to align as well, they should stay in center. How can I achieve a state, where I can align portions of this formula to my liking? I am also attaching a picture so it can be visually examined.

Thanks in advance