$1+x+3xy+3y\:$
$3000-375$
$\frac{5x}{4}-2-\frac{6\left(x+3\right)}{2}<\frac{5x}{7}-\frac{8x+1}{14}+\frac{3}{7}$
$\left(\frac{1}{2}+va\right)^5$
$4m^2+7m-15$
$9x^2+12x+7$
$7-10-5-4+6-1$
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