Xiao Pang goes to the stationery store to buy stationery. With the money he brought, if he buys a pen worth 9.8 yuan, there will still be 5.2 yuan left. If he buys a 5.8 yuan fountain pen instead, how much money can he have left?
小胖去文具店买文具，他所带的钱，如果买9.8元的钢笔后，还能剩下5.2元．如果改买5.8元的水笔，他还能剩下多少钱？
<gadget id="calculator">5.2 - 5.8</gadget>
<output>-0.6</output>

<gadget id="calculator">9.8 + (-0.6)</gadget>
<output>9.2</output>

<result>9.2</result>