$-7\left(a+3a+3\right)-5a$
$\lim_{x\to1}\left(\frac{x^{19}-1}{x^{13}-1}\right)$
$3x^5-243x+6x^4-486$
$16\cdot16\cdot4$
$1000=x^2-40x+500$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)\sin\left(4x\right)}{x^2\cos\left(x\right)}\right)$
$\left(-30\right)\left(-30\right)$
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