The three columns of a grid are supposed to add up to the same total, but two of the numbers have been swapped. Figure out which numbers are in the wrong places.

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What I Didn't Do

I added the grids on the right so you could transfer the correct answer over, but having now played it a number of times, I've realised that simply circling the two that need swapped is actually good enough..

Aw well. Use the space for scribbles or something