$\left(x+5\right)\left(x+8\right)\ge\left(x+4\right)\left(x+9\right)+4$
$7.15\cdot10^8$
$3a+2\left(a+4\right)$
$30x-12$
$\frac{3}{\frac{\frac{x}{2}}{7x}}-1$
$\int\left(\frac{1}{x^2+6x+10}\right)dx$
$\left(\sqrt{2}+4\right)\left(\sqrt{2}-4\right)$
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