What is the combined formula of "45-15=30" and "210/30=7"?
把"45-15=30"和"210/30=7"合并成综合算式是多少．
<gadget id="calculator">45 - 15</gadget>
<output>30</output>

<gadget id="calculator">210 / 30</gadget>
<output>7</output>

<result>7</result>