If the perimeter of the triangle is 48, the first side is 4A + 3b, and the second side is 2a-b less than 2 times of the first side, then the third side is 4A + 3B______ ．

48-（4a+3b）-[2（4a+3b）-（2a-b）]=48-4a-3b-[8a+6b-2a+b]=48-4a-3b-8a-6b+2a-b=48-10a-10b．

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