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(integrate 1 dy dx, x=0 to 2, y=x/3 to 3*x) +(integrate 1 dy dx, x=2 to 6, y=x/3 to 12/x)
(integrate 1 dy dx, x=0 to 2, y=x/3 to 3*x) +(integrate 1 dy dx, x=2 to 6, y=x/3 to 12/x)
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