For a batch of goods, 25% of the goods were transported for the first time, and (1/2) more tons were transported for the second time than the first time, and 7 tons were left to be transported. How many tons are there in total for this batch of goods?
一批货物，第一次运走25%，第二次运走的比第一次多(1/2)吨，还剩7吨没运走，这批货物共有多少吨？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + 7</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">0.75 - 0.25</gadget>
<output>0.5</output>

<gadget id="calculator">(15/2) / 0.5</gadget>
<output>15</output>

<result>15</result>