Solve the equation: 3x-7/0.28=8.6.
解方程：3x-7/0.28=8.6．
<gadget id="calculator">7 / 0.28</gadget>
<output>25</output>

<gadget id="calculator">25 + 8.6</gadget>
<output>33.6</output>

<gadget id="calculator">33.6 / 3</gadget>
<output>11.2</output>

<result>11.2</result>