Subtract the sum of 3.75 and 0.25 from twice a number, and the difference is 26. What is this number?
一个数的2倍减去3.75与0.25的和，差是26，这个数是多少？
<gadget id="calculator">3.75 + 0.25</gadget>
<output>4</output>

<gadget id="calculator">4 + 26</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>