$\lim_{x\to-4}\frac{6x+5}{2-\sqrt{14+5x}}$
$\frac{d}{dx}\left(x^x\right)\left(3x^3+2\right)\left(x^2+5\right)^3$
$\frac{2x^2}{2x^2-4x+3}$
$270\cdot4$
$5x^2=50x$
$5n-2n^2-15m+6mn$
$10\cdot\left(3+8-6\right)$
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