Blanch has 15 slices of pizza in the fridge. During breakfast, she eats 4 slices. At lunch, Blanch eats 2 slices, then takes two slices as a snack. Finally, she consumes 5 slices for dinner. How many slices of pizza are left?
During breakfast, Blanch has 15 - 4 = 
<gadget id="calculator">15-4</gadget>
<output>11</output>
11 slices left.
At lunch, she still has 11 - 2 = 
<gadget id="calculator">11-2</gadget>
<output>9</output>
9 slices left.
After the snack, there are still 9 - 2 = 
<gadget id="calculator">9-2</gadget>
<output>7</output>
7 slices left.
Finally after dinner, Blanch has 7 - 5 = 
<gadget id="calculator">7-5</gadget>
<output>2</output>
2 slices left.

<result>2</result>