One factor is 5 and the other factor is 42. If the factor 5 increases to 7 and the other factor remains unchanged, how much does the product increase?
一个因数是5，另一个因数是42，如果因数5增加到7，另一个因数不变，积就增加多少
<gadget id="calculator">42 * 7</gadget>
<output>294</output>

<gadget id="calculator">294 - 210</gadget>
<output>84</output>

<result>84</result>