$x-5+\frac{6}{x}=0$
$\frac{2x^2-4x+19}{x^2+2x+1}$
$5x+15<\frac{10x}{25}-100$
$-23+-155$
$\left(-21ab^2\right)+\left(14ab^2\right)$
$mercury$
$\left(\frac{3}{5}+\frac{a}{2}\right)^2$
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