\(14.7^{2021}=35.7^{2021}-3.49^x\)
\(\Leftrightarrow2.7^{2022}=5.7^{2022}-3.7^{2x}\)
\(\Leftrightarrow3.7^{2x}=3.7^{2022}\) \(\Leftrightarrow7^{2x}=7^{2022}\)
\(\Leftrightarrow2x=2022\Leftrightarrow x=1011\) (TM \(x\in Z\))
Vậy \(x=1011\)
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