$\frac{3x+7}{2}+\frac{1+x}{3}$
$g^2-6g+3$
$\left(2+5\right)-\left(5+4\right)$
$\frac{1}{x^3-4}$
$\frac{x-1}{x-1}$
$2x\:-\:5\:<\:9$
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