$f\left(x\right)=\frac{2}{x^2+3}-\frac{1}{2}$
$\left(g-9b\right)^5$
$\frac{x}{x+1}\:+\frac{2x}{x+1}$
$5+3x<4-x$
$\left(m+3n\right)\left(m-3n\right)$
$583\cdot49$
$\left(13k\right)\left(2k\right)$
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