The Yangtze River is the largest river in my country, with a total length of 6370 km, ranking third in the world. The longest river in the world is the Nile River, with a total length of x kilometers, which is 300km longer than the Yangtze River. List the equation according to the meaning of the question to find the total length of the Nile River.
长江是我国第一大河，全长6370km，位居世界第三．世界最长的河流是尼罗河，全长x千米，比长江还要长300km．根据题意列出方程，求尼罗河全长．
<gadget id="calculator">6_370 + 300</gadget>
<output>6_670</output>

<result>6_670</result>