Two barrels of exactly the same shape and size contain equal quantities of liquids A and B, both of which are xkg. After liquid A is used up (3/10) kg, and liquid B is used up (3/10), the mass of the remaining liquid in the two barrels is equal, find x.
形状和大小完全相同的两只桶装有相等的甲乙两种液体都是xkg．甲液体用去(3/10)kg，乙液体用去(3/10)后两桶剩余的液体质量相等，求x．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / (3/10)</gadget>
<output>1</output>

<result>1</result>