(1/2)*(1/3)+(1/5)*(1/3)-(7/10)*(1/3).
(1/2)*(1/3)+(1/5)*(1/3)-(7/10)*(1/3)．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) * (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/3)</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(7/10) * (1/3)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(1/15) - (7/30)</gadget>
<output>-1/6 = around -0.166667</output>

<gadget id="calculator">(1/6) + (-1/6)</gadget>
<output>0</output>

<result>0</result>