$9x^2-42x+49=0$
$x^2+5\le0$
$2x-8>x+1$
$-\frac{200}{100}$
$\frac{x^4}{x^4}$
$\left(\frac{1}{2}+\:4x\right)^3$
$4x^2+23x+33=2x+8$
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