In a subtraction formula, the sum of the minuend, the subtrahend, and the difference is 160. If the difference is 7 times the subtrahend, what is the difference?
一个减法算式里，被减数、减数、差这三个数的和是160，已知差是减数的7倍，则差是多少．
<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 7</gadget>
<output>70</output>

<result>70</result>