-4+x=3x+12 (Pls explain how you got it)

For an easy answer and to be able to answer these problems on your own, I recommend using Desmos. It is a graphing calculator website and all you have to do is type in both sides of the equation in different cells and it will give you the exact point that they cross. Your answer will be the first number in the ordered pair. I hope this helps you with your current and future problems. There is also a testing version of Desmos that you might use during a state test eventually.