$-5x-4x-8y+9y-7x$
$4n-8\le12$
$\int\frac{\left(\sqrt{x}-4\right)^3}{\sqrt{x}}dx$
$a^2+24x^2a^3+144x^4a^4$
$-231+79+51$
$\lim_{x\to2}\frac{x\left(x^2+3x+2\right)}{x^2-x-6}$
$y^2+9y=\sec^2x$
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