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Full question is A decimal machine that carries 15 decimal places in its floating point numbers...

Full question is

A decimal machine that carries 15 decimal places in its floating point numbers is designed to chop numbers. If x is a real number in the range of this machine and x' is its machine representation, what upper bound can be given for |x-x'|/|x|?

I don't understand step 1 that alteratively rewrite equation from |x-x'|/|x| to |x-x'|/|x'|.

in exercises of chapter 1.3 (Numerical Mathematics and Computing).

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