Solve the equation: 5X/7+2=2.5.
解方程：5X/7+2=2.5．
<gadget id="calculator">2.5 - 2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 * 7</gadget>
<output>3.5</output>

<gadget id="calculator">3.5 / 5</gadget>
<output>0.7</output>

<result>0.7</result>