x-(2/3)x-5=18．
x-(2/3)x-5=18．
<gadget id="calculator">5 + 18</gadget>
<output>23</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">23 / (1/3)</gadget>
<output>69</output>

<result>69</result>