The answer is x = 3.
Here are the steps.
1. Simplify 20x - 40 + 10 to 20x - 30 ( 20x - 30 = 30).
2. Add 30 to both sides ( 20x = 30 + 30).
3. Simplify 30 + 30 to 60 ( 20x = 60).
4. Divide both sides by 20 ( x = 60/20).
5. Finally, simplify 60/20 to 3 ( Lastly x = 3).