First, let's isolate the unknown number by getting rid of the -200 on the left side of the equation. To do this, we add 200 to both sides of the equation:
200 x ?? - 200 + 200 = 200 + 200
This simplifies to:
200 x ?? = 400
Now, we need to solve for the unknown number. To do this, we divide both sides of the equation by 200:
(200 x ??) / 200 = 400 / 200
The 200 on the left side of the equation cancels out, leaving us with:
?? = 400 / 200
Simplifying further:
?? = 2
Therefore, the missing number in the equation 200 x ?? - 200 = 200 is 2