Question

what is happening at this step in the equation solving process for 3x+7=5x
7=2x

Answer 1

Your subtracting 3x from 5x: 5x-3x
This is so you only have a variable on one side

Answer 2

3x+7=5x
-3x -3x
7=2x
(Divide both sides by 2)
x=3.5