Solve the equation: (2/7)x+600=(1/3)x.
解方程：(2/7)x+600=(1/3)x．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(1/3) - (2/7)</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">600 / (1/21)</gadget>
<output>12_600</output>

<result>12_600</result>