$\frac{x^2+1}{x^2-x-2}$
$\left(\left(x-1\right)^7-\left(x-2\right)^7-1\right)$
$\left|-62\right|$
$-10\left(-10\right)-10\left(-10\right)$
$\left(5x-3x^2\right)^2$
$\left(3.5xy+2.5x\right)^2$
$x^2+2x+6\le5$
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