Solve the equation: 200-40%x=120.
解方程：200-40%x=120．
<gadget id="calculator">200 - 120</gadget>
<output>80</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 / (2/5)</gadget>
<output>200</output>

<result>200</result>