To do that, I can use algebra and try to isolate $x$ on one side of the equation. I notice that there are some constants on both sides that I can simplify. I can combine $6500 - 4500$ on the left side and get $2000$. Similarly, I can combine $3400 + 2000$ on the right side and get $5400$. So the equation becomes $2000 + x = 5400$. Now I can subtract $2000$ from both sides to eliminate it from the left side. I get $x = 5400 - 2000$, which is $x = 3400$. So $x = 3400$ is the value that makes the equation true. 
For what value of $x$ is the following equation true: $6500 + x - 4500 = 3400 + 2000$?