Answer:
By doing the opposite action from its side to the side the 4x is on
Explanation:
For example, in this equation 4x+3=3x, the 4 is positive, so u subtract it from the left side.
After this, you get 3=3x-4x, 3=-x, so x=-3
You can do that for other equations too, with a picture, solving your problem would be easier for me