Why there is only one solution of the monotonous functions, when all of the functions all monotonous?(adsbygoogle = window.adsbygoogle || []).push({});

For example, I read that this example is monotonius function and because of that have only one solution

[tex]5^x + 7^x=12^x[/tex]

x=1

btw- how to solve monotonius functions?

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# Monotonius function

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