Given 2.1: x=1(2/5), find the value of x.
已知2.1：x=1(2/5)，求x的值．
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">2.1 / (7/5)</gadget>
<output>1.5</output>

<result>1.5</result>