The rectangle is (9/10) meters long and (7/10) meters wider than it is wide. How many meters is it wide?
长方形长(9/10)米，比宽多(7/10)米，宽多少米？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(9/10) - (7/10)</gadget>
<output>1/5 = around 0.2</output>

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