a: \(x=4\cdot23=92\)
b: \(\left(2x-1\right)^7=\left(2x-1\right)^3\)
\(\Leftrightarrow\left(2x-1\right)^3\left[\left(2x-1\right)^4-1\right]=0\)
\(\Leftrightarrow\left(2x-1\right)^3\cdot\left(2x-2\right)\cdot2x=0\)
hay \(x\in\left\{0;1\right\}\)
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