Solve the equation: (18/19)x-(7/19)x=121.
解方程：(18/19)x-(7/19)x=121．
<gadget id="calculator">18 / 19</gadget>
<output>18/19 = around 0.947368</output>

<gadget id="calculator">7 / 19</gadget>
<output>7/19 = around 0.368421</output>

<gadget id="calculator">(18/19) - (7/19)</gadget>
<output>11/19 = around 0.578947</output>

<gadget id="calculator">121 / (11/19)</gadget>
<output>209</output>

<result>209</result>