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3200 3 96005200 5.2 27040 X 10 10X-----------------------8400+X 5.2 36640+10X(8400+X)*5.2 = 36640+10X43680+5.2X = 36640+10X43680-36640 = 10X-5.2X4.8X = 7040X=1466.666667