$a5+9^4$
$12xy-30xz$
$y^2-2x^3=33$
$2.x+7\le3$
$\frac{2}{3x^2+11x+6}+\frac{x+2}{x^2-9}+\frac{1}{3x+2}$
$n^2-10n+25$
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