If 2x+1=3, then 2.5x-1.2x=what
如果2x+1=3，那么2.5x-1.2x=多少
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<gadget id="calculator">2.5 * 1</gadget>
<output>2.5</output>

<gadget id="calculator">1.2 * 1</gadget>
<output>1.2</output>

<gadget id="calculator">2.5 - 1.2</gadget>
<output>1.3</output>

<result>1.3</result>