$\lim_{x\to4}\left(\frac{x^3-8}{x^2+2x-24}\right)$
$\left(x+\:y\right)^7$
$89-\left(2\cdot34\right)-89$
$x^2-4x+xy$
$\left(9x-6\right)+\left(-5x+7\right)$
$\left(2x^2x\right)^2$
$x\cdot2x^3$
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