3cx-2,1-cx) the result of removing brackets and simplifying is x-2, then c=how much.
3cx-2,1-cx)去括号化简的结果是x-2，则c=多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>