The Beijing-Hangzhou Grand Canal in my country is the longest canal in the world, with a length of 1,794 kilometers, which is 51 kilometers longer than three times the length of the Erie Canal in the United States. How long is the Erie Canal in the United States? (Solve using the method of listing equations)
我国的京杭大运河是世界上最长的运河，长1794千米，比美国的伊利运河长度的3倍多51千米．美国的伊利运河长多少千米？(用列用方程的方法解答)
<gadget id="calculator">1_794 - 51</gadget>
<output>1_743</output>

<gadget id="calculator">1_743 / 3</gadget>
<output>581</output>

<result>581</result>