$3x^2\:+\:3x-9$
$5x+2<4a+2+x$
$\lim_{x\to-1}\left(\frac{7x^2-2x+1}{3x^2+8x+5}\right)$
$\int5xe^{6x^2}dx$
$\frac{9x-21x+12}{3-2}$
$\frac{\left(3x^3-5x^2+3x-5\right)}{x^2+1}$
$\int\frac{a+a^2+3+a^3}{4a^2+3+a^4}da$
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