Calculating the voltage at Node A
You have an voltage divider.
When you have two 1000 ohm resistors in parallel like this, then it equals one 10V source with 500 ohm resistor in series with it.
When you make voltage divider with two resistors of the same value, then you divide the voltage by 2.

10V / 2 = 5V

It means that on point A you will get 5V.