If 0.5x+3.6=5.6, then 2.4x-4.8=how much.
如果0.5x+3.6=5.6，那么2.4x-4.8=多少．
<gadget id="calculator">5.6 - 3.6</gadget>
<output>2</output>

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

<gadget id="calculator">2.4 * 4</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 - 4.8</gadget>
<output>4.8</output>

<result>4.8</result>