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To compute the cost of each mechanical pencil, we need to subtract the cost of the erasers from the total amount Mr. Spears has to spend.
The cost of the erasers is x erasers * $0.50 per eraser = $0.50x.
So the equation becomes: x + $0.50x = $25.
Combining like terms: 1.50x = $25.
To solve for x, we divide both sides of the equation by 1.50: x = $25 / 1.50.
The missing placeholder would be 25 / 1.50.