In a subtraction formula, the sum of the minuend, the subtrahend and the difference is 256, and the subtrahend is 12 less than the difference. What is the difference?
在一个减法算式里，被减数、减数与差这三个数的和是256，减数比差小12，求差是多少？
<gadget id="calculator">256 / 2</gadget>
<output>128</output>

<gadget id="calculator">128 + 12</gadget>
<output>140</output>

<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<result>70</result>