Mr Spears was purchasing supplies for his math classroom. He had $25 to spend. Mechanical princess and erasers come in bundles of 10. Easy racer cars 50 cent. Fill in the missing place and the equation to complete the cost of each mechanical pencil

-----(x + 0.50)=25

In order to find the value of x, the cost of each mechanical pencil, we need to rearrange the equation using inverse operations.

To isolate x, we can subtract 0.50 from both sides of the equation:
x + 0.50 - 0.50 = 25 - 0.50
x = 24.50

Therefore, the cost of each mechanical pencil is $24.50.