"x" is the name of the number that satisfies the equation. We, of course, do not know that the value of this number is, only we know that this number + 4 is 2 times this number - 5.
Taking a guess for the possible value of x is hard on the brain, but fortunately, we have methods of algebra to help us.
The first step is to subtract 4 from both sides of the equation. Doing this gives us
Now we need to subtract 2x from both sides. This gives
And multiplying both sides by -1 gives
which is our answer!