$\frac{x^3+x-3}{x+4}$
$2x^2+6x+5x$
$\left(8a+3\right)^2$
$x^2-18x+81<0$
$\left(a+6\right)\left(a-9\right)$
$25.5-1.5+8.5$
$x^2+4x<\left(x+2\right)^2$
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