Description: Worked example: Learn to solve the equation 2x + 3 = 5x - 2. Created by Sal Khan. Let's try to solve a more involved equation. So, let's say that we have 2x plus 3, 2x plus 3 is equal to is equal to 5x minus 2. The the important thing to remember is, we just want to isolate an x.*Teacher Advisor is 100% free.