Subtract two numbers, the difference is 9.6, the minuend increases by 3.5, the subtrahend decreases by 2, what is the difference
两个数相减，差是9.6，被减数增加3.5，减数减少2，差是多少
<gadget id="calculator">5 + 9.6</gadget>
<output>14.6</output>

<gadget id="calculator">14.6 + 3.5</gadget>
<output>18.1</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">18.1 - 3</gadget>
<output>15.1</output>

<result>15.1</result>