(7/10)-(2/10)+(3/10).
(7/10)-(2/10)+(3/10)．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) + (3/10)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>