One cable takes up 12 meters, and the rest is 3 meters less than the original (2/5). How many meters of this cable are left?
一根电缆用去12米，余下的比原来的(2/5)少3米．这根电缆还剩下多少米？
<gadget id="calculator">12 - 3</gadget>
<output>9</output>

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

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">9 / (3/5)</gadget>
<output>15</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<result>3</result>