The price of a brand A soymilk machine is 129 yuan, and the price of a brand B soymilk machine is three times that of A brand. How much is the difference between the two brands of soymilk machines?
A品牌豆浆机每台129元，B品牌豆浆机的价格是A品牌的3倍，两种品牌豆浆机每台相差多少元？
<gadget id="calculator">129 * 3</gadget>
<output>387</output>

<gadget id="calculator">387 - 129</gadget>
<output>258</output>

<result>258</result>