$29-\left(-1\right)-\left(-6\right)$
$\frac{x^2+x+1}{x^2+1}$
$x^3+3x^2+x$
$2-78$
$\frac{2x}{\left(x+1\right)\left(x^2+1\right)^2}$
$\frac{x^61}{x-1}$
$-5-\left(-63\right)$
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