Calculation: 3-(3/2)*(10/21)-(2/7)=how much.
计算：3-(3/2)*(10/21)-(2/7)=多少．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">10 / 21</gadget>
<output>10/21 = around 0.47619</output>

<gadget id="calculator">(3/2) * (10/21)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 - (5/7) - (2/7)</gadget>
<output>2</output>

<result>2</result>