$\frac{9}{\left(1+8x\right)^2}$
$9v-12+4$
$\lim_{x\to0}\frac{\sqrt{x+3}-\sqrt{3}}{x}$
$63-\left(-80\right)$
$4x-13\le2x+15$
$2^2x\:2^4$
$-3x^2:x$
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