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Find the product of [4 a +3/7 a square]and[7 a square-a square] and verify the result for a=-2.

At x=-2,            =24(-2)3+18/7(-2)4
                         =24 x -8 +18/7 * 16
                         =192 + 288/7
                         =(1344+288)/7
                         =1632/7


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