Answer :

konrad509
[tex]9^{4x}=81\\ 9^{4x}=9^2\\ 4x=2\\ x=\dfrac{2}{4}=\dfrac{1}{2}[/tex]
eu99li
[tex]9^{4x}=81\\ 9^{4x}=9^2\\ =\ \textgreater \ 4x=2\\ x=\dfrac{2}{4}^{/2}=\dfrac{1}{2}[/tex]

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