If 4x+3=11, then, 0.8x+7.8=how much.
如果4x+3=11，那么，0.8x+7.8=多少．
<gadget id="calculator">11 - 3</gadget>
<output>8</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">0.8 * 2</gadget>
<output>1.6</output>

<gadget id="calculator">1.6 + 7.8</gadget>
<output>9.4</output>

<result>9.4</result>