It is known that 5x+8=13, then 2x+8=how much.
已知5x+8=13，那么2x+8=多少．
<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">5 / 5</gadget>
<output>1</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 + 8</gadget>
<output>10</output>

<result>10</result>