If 8x-1=19 then x=how much.
若8x-1=19则x=多少．
<gadget id="calculator">19 + 1</gadget>
<output>20</output>

<gadget id="calculator">20 / 8</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>