6/(2/3)-3.5x=6.
6/(2/3)-3.5x=6．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 * (2/3)</gadget>
<output>4</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">3.5 * (2/3)</gadget>
<output>2.333333</output>

<gadget id="calculator">2 / 2.333333</gadget>
<output>0.857143</output>

<result>0.857143</result>