Subtract 0.7 from 8.6, subtract 4 times in a row, what is the result?
8.6减去0.7，连续减4次，结果是多少
<gadget id="calculator">0.7 * 4</gadget>
<output>2.8</output>

<gadget id="calculator">8.6 - 2.8</gadget>
<output>5.8</output>

<result>5.8</result>