Solving a hard equation

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I have the given equation: (6^x+6^-x)/6 = 2. How do you solve this?
 

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arildno
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1. Multiply your equation with [tex]6^{x}[/tex]
2. You have now a quadratic equation in the unknown [tex]y=6^{x}[/tex]
As an alternative, use the identity:
[tex]Cosh(t)=\frac{e^{t}+e^{-t}}{2}[/tex]
 
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