$\frac{x^4-9x^2-5}{x-2}$
$3a+1\le7a+5$
$\int5x^4\left(x^5+4\right)^2dx$
$5z-4z$
$\lim_{x\to-5}\left(\frac{x^2-3x-10}{2x^2+15x+25}\right)$
$\int\frac{14x+6}{7x^2+6x+8}dx$
$1d^2+6d^2+5+2$
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