Hey there!☺
Sanjai had $175 in his bank account before he got paid this week. And now his total is $287. Represent x as how many he got after he paid. So that means you do $175 + x = $287.
We have to find x and see how much money he got paid to get 287 in his balance.
x is equal to 112. Let's see if $112 makes x true.
That makes x true which means he got paid $112.
Hope this helps!☺