There are two options that modify the way the formulas are displayed:

"left equation numbers" 
This causes all displayed formulas to be aligned at the left margin. 

"left equation numbers" 
All numbered formulas would get the numbers on the left side instead of the right. 
Often, formulas are not displayed just standalone. We may encounter situations where:
We may also encounter similar situations, where we have to write multiline formulas, often with some kind of alignment. ...
No credit card required