The difference of a subtraction formula is 12.9, if the minuend and the subtrahend are increased by 3 and 5 respectively, what is the difference?
一道减法算式的差是12.9，如果被减数和减数分别增加3和5，得到的差会是多少？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">12.9 - 2</gadget>
<output>10.9</output>

<result>10.9</result>