I have two questions begging for answers:

(i)When posting lines of simplification or equation using latex, how do I align the lines of simplification or equation in a single column I have two questions begging for answers:

(i)When posting lines of simplification or equation using latex, how do I align the lines of simplification or equation in a single column such that the equal signs or arrow signs will be on side- left side ?

(ii) How do increase the font size of my equation in latex??

(ii) How do increase the font size of my equation in latex?