$\frac{1}{5y+1}+\frac{2}{7-y}$
$\frac{12a^5b^2}{6\:ab^5}$
$-\left(x^5\right)^4$
$x^2-x-2\le0$
$f\left(x\right)=\sec\left(2x-4\right)$
$4x^2-6x+1=0$
$y^2+1y+27$
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