$x^2+11x+9$
$\frac{x^5+12}{x^2+x+2}$
$-x^{a+1}+x^{a+1}$
$\lim_{x\to\frac{1}{2}}\left(4x^2-8x\right)$
$-\frac{54}{6}$
$-4^1$
$-15\left(-11\right)+5\cdot\left(-4\right)$
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