$\frac{5}{2x}-\frac{8}{9}=\frac{1}{18}-\frac{1}{3x}$
$\left(4x^2+1^2\right)$
$\sqrt{1}+\sqrt{9}+10\sqrt{4}$
$x^2e^2x$
$2x-18+-6x-2$
$9b^2-100m^2$
$f+47=100$
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