Jerry had some action figures on a shelf in his room. Later he added w more action figures to the shelf. If there are a total of x action figures on his shelf now How many action figures did he have initially on the shelf?

Jerry had some action figures on a shelf. This is represented by the equation:

x + w = y

Later, he added more action figures to the shelf. This is represented by the equation:

y + z = t

Now, we have to figure out how many action figures Jerry had originally on the shelf. In order to do that, we have to solve for x. 

We can do this by using substitution. We'll start by solving for y in the first equation:

x + w = y

y = x + w

Now we'll plug this value of y into our second equation:

y + z = t

(x + w) + z = t

Now we can solve for x:

x + w + z = t

x = t - w - z