$\lim_{x\to-1}\frac{x^2-3x+2}{2x+1}$
$9\left(-4+6\right)+2\left(-2+9\right)$
$\sqrt[3]{\left(-7\right)^3}$
$4x^{2}+72xy+54y^{2}$
$\left(x^5+5\right)^2$
$8c^3-7c^3+16c^3$
$a^2^n+15a^n+54$
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