If ((10000-3*□)+6)/5+13=2013, then what is the number in □.
若((10000-3*□)+6)/5+13=2013，那么□中的数是多少．
<gadget id="calculator">10_000 / 5</gadget>
<output>2_000</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">13 - 2_013</gadget>
<output>-2_000</output>

<gadget id="calculator">2_000 + (6/5) + (-2_000)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(6/5) / (3/5)</gadget>
<output>2</output>

<result>2</result>