$x^2e^{\frac{x}{x}}$
$\left(4a-5b\right)\left(6a+3b\right)$
$\frac{2x-3}{x\left(x+1\right)}$
$\frac{3x-1}{\left(x+4\right)^2}$
$8r+12p-7-3p$
$\frac{y}{2}+19\ge20$
$706\cdot9$
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