$\sqrt{144}9$
$\frac{x^{-1}}{4x^4}$
$x^2+\frac{-1}{x^2}+1$
$-44-36-61$
$6\cdot\left(2x-5\right)-7\le-2\cdot\left(5x-2\right)$
$\left(81x+4\right)^2$
$3x+1=\frac{6}{x+2}+2x$
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