$\lim_{x\to1}\left(\frac{x^2+3x-4}{1-x}\right)$
$\lim_{x\to0}\left(\frac{x^3+4x^2}{x^5-2x^2}\right)$
$\left(x+43\right)^3$
$6^{-6}\cdot6^7$
$-30+8-\left(-5\right)+1-5\left(-3\right)+\left(-7\right)$
$x^4-2\left(a^2+b^2\right)x^2+\left(a^2-b^2\right)^2$
$-13-\left(-13\right)$
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