Subtracting 123456789 from 246913578 in left-to-right order - Step 18

I'm now subtracting 9 in the 9th position from the left. This is done in 2 steps: subtract 10, add 1. In this step I add 1.

 

This completes the subtraction operation. The final result can be read off as 123456789.

 

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Done