The refrigerator factory plans to produce 720,000 refrigerators this year, 60,000 less than twice the output of last year. How many thousands of refrigerators were produced last year? (solution by equation)
电冰箱厂今年计划生产冰箱72万台，比去年产量的2倍少6万台．去年生产冰箱多少万台？(用方程解)
<gadget id="calculator">72 + 6</gadget>
<output>78</output>

<gadget id="calculator">78 / 2</gadget>
<output>39</output>

<result>39</result>