$4x+9<49$
$r\left(x\right)=\frac{5x}{x^2-x-2}$
$\int\frac{x-1}{x^2-6x+9}dx$
$2x\:-\:27\:>\:23$
$36m^2+60mn+16n$
$3xz-4z$
$\left(5x-1\right)\left(2x+4\right)$
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