What is the solution for x in this right triangle using Pythagoras theorem?

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The answer is 5cm according to the book, but I couldn't get that number in several tries.

Right triangle with legs measuring x and 12, and hypotenuse measuring (x+8)

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$$ 16x+64=(x+8)^2-x^2=12^2=144 \; \Rightarrow \; x=5 $$