The perimeter of a rectangle is 200 meter. The breadth is $\frac{3}{7}$ part of the length . What is the length? (একটি আয়তক্ষেত্রের পরিসীমা ২০০ মিটার। প্রস্থ দৈর্ঘ্যের ৩/৭ অংশ হলে, দৈর্ঘ্য কত?)

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