If a and b are reciprocals of each other, and (7/(a))=((b)/(x)), then x=how much.
如果a与b互为倒数，且(7/(a))=((b)/(x))，那么x=多少．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>