$3x+5\le4-x$
$b^{2}-3b+4$
$\sqrt[4]{0}$
$2x\:-\:18\:=\:30$
$5x-9-9x^2-3x-5$
$\frac{26x^2+6x-9}{x^2+1}$
$7x^2-4x+5.3x+4$
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