$-3a+52a$
$\ln\sqrt{x+9}=2$
$\lim_{x\to\infty}\left(-3x^2+5x-7\right)$
$\lim_{x\to1}-\left(\frac{x^3+1}{x^4-1}\right)$
$\left(x^2+12\right)\left(x^2-12\right)\:$
$\frac{x-3}{3}-\frac{y-4}{4}=0$
$\frac{6}{3x^5}$
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