The sum of two numbers is 7.85. If one addend is increased by 0.05 and the other is decreased by 0.8, what is the sum?
两个数的和是7.85，如果一个加数增加0.05，另一个加数减少0.8，则和是多少
<gadget id="calculator">0.05 - 0.8</gadget>
<output>-0.75</output>

<gadget id="calculator">7.85 + (-0.75)</gadget>
<output>7.1</output>

<result>7.1</result>