Which tool will make the last scale balance?

Answer of the puzzle Which tool will make the last scale balance? is : Hammer

The first tool hammer will balance the last scale.

To simplify the equation we can re-write in the below form

AAA = B

BB = CA

CC = BBB?

if you replace the last equation to have only one vaariable it will be like

AAAAAAAAAA (10A) = AAAAAAAAA(9A)?

So that tool A will balance the scale

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