5x-3*(7/10)=(7/5).
5x-3*(7/10)=(7/5)．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3 * (7/10)</gadget>
<output>21/10 = around 2.1</output>

<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(21/10) + (7/5)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) / 5</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>