$\frac{1}{4}\left(-2\right)^2$
$1-\log x+\log\left(11-x\right)=0$
$25x^5+9x^3+80x^2-30x+20\:\cdot2x^2-7$
$\frac{12^{10}\cdot18^{5}\cdot16^{-1}}{8^{5}\cdot54^{6}}$
$4x^2-64=0$
$\left(2b-5\right)\left(2b+5\right)$
$\left(8a^2-5\right)^2$
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