$\left(2\right)^5.2^0$
$\frac{81x^2-16}{9x^2+4}$
$2x+7\cdot2x$
$\lim_{x\to9}\left(\frac{x^2-x-72}{x-9}\right)$
$\left(x-3\right)^2\left(x-2\right)-5\left(x-3\right)$
$7\left(x+4.9\right)=56$
$\frac{\sqrt{x}}{\left(3x+4\right)^2}$
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