What is x?

2x - x + 7 = x + 3 + 4

X is equal to 1 becuz 2x-x equals x+7=x+7 then divide 7 by itself and it's 1

First, simplify by adding common variables (numbers or letters)

x+7 = x+7

You can stop here, because this is always true. So you can plug in any number for x. The answer is all the numbers in the world, ever.