( SOMEONE ANSWER PLEASE ) [ I WILL GIVE BRAINLIEST ] to the person who can explain as to how to do an equation like this. I need an explanation because I want to understand the concept. How do you do an equation like this? ( LOOK AT IMAGE PLEASE )

SOMEONE ANSWER PLEASE I WILL GIVE BRAINLIEST to the person who can explain as to how to do an equation like this I need an explanation because I want to unders class=