Okay!
The most important part of this problem is knowing which inequality sign to use
Greater than >
Less Than  <
Equal to .. =
Greater or equal to ≥
Less than or equal to  ≤
Charlotte needs AT LEAST 5,000 votes, meaning she has to have 5,000 votes or more
That means we use this sign →  ≤
Now lets set up an equation to find how many more we need
5,000  ≤  3,187 + X
solve for X
1,813 ≤ X
Hope I helped :) Sorry for the long explanation