$\left(.18\right)-4$
$\left(-100\right)+\left\{\left[\left(678\right)-\left(276\right)+\left(132\right)\right]\left(+132\right)\right\}$
$\frac{n^2x^{2n}}{2^{2n}}$
$\lim_{x\to\infty}\left(\frac{x^2+x+1}{x^2-x+1}\right)^{x^2}$
$\left(729p^3-216s^3\right)$
$2x^2+7y+4x+6x^2$
$-11+6-28+43$
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